Grow Native Mass has a good list here:

https://grownativemass.org/Great-Resources/nurseries-seed

I ordered seeds from Wild Seed Project in October. Most need a cold stratification period but im sure there are some still available. Weston Nursery also has native plants available in the spring and there is lots of good info available on Native Plant Trust web site

Thanks. Do you know what native plants require little care? I'm hoping for something I can just spread seeds with little to no care. I am not very good at planting, and not a lot of availability to do so either.

Lots of local libraries have seed libraries where they give the seeds (and instructions) out for free.

Most natives don't require much care, this is their home environment so not much to it as long as they get the required sun. The amount of sun will dictate what seed to get. I'd say any of the asters, bee balms, golden rods, cone flowers and Joe pye weed would be easy enough.

Garden in the Woods in Framingham

Russell’s Garden Center in Wayland

See more at:

https://www.mass.gov/service-details/garden-centers-and-nurseries-that-sell-native-plants

Homedepot has bags of native flower seeds.

We didn't grow them from seed but we bought some native mint plants at Allandale Farm in Brookline in 2021 and it spread everywhere. I think we planted 3 plants and last year we had like 40.

Yup, Somerville west branch by Davis square has a gardening kit

I love that they do this. Westwood has an excellent one.

Also, OP, check your local garden club. There might even be some members who are willing to give you some seeds or plants to get you started.

Check out Fedco seeds. They're a wonderful co-op company out of Maine that offers fabulous seeds and much more. I've been ordering from them for years, growing beautiful flowers, fruits and vegetables. I believe they offer a seed pack that is a mix of native wildflowers. Give them a look, happy growing!

Thats good to hear, Broad Mountain Mint is one that I am looking to plant this year.

Lots of places have wildflower seeds— you can find lists from Wild Ones for instance or your local UMass Cooperative Extension.

These lists are only good if you understand your growing conditions (shade, sun, soil type), and how much work you want to do to establish and maintain them i.e. watering, weeding, thinning.

Here’s a good list of resources:

https://ag.umass.edu/resources/home-lawn-garden/fact-sheets/flowers

I’ve had great luck growing Purple Coneflower from seed (if you’re looking for something easy to both start and maintain). Sunflower is also super easy to grow and will flower in one growing season.

In general starting from seed can be tricky — it helps to have a weed-free bed and to start them in late fall so that they establish themselves early in the spring.

If you plan to direct sow them now, you should look for varieties that do not require cold stratification (periods of freezing and thawing). Also you shouldn’t expect flowering until next year (or late summer/early fall) if you plan on starting perennials. There aren’t a whole lot of plants that will do much in their first season, other than annuals.

In a study in more than 6,000 adults, those who reported eating sunflower seeds and other seeds at least five times a week had 32% lower levels of C-reactive protein compared to people who ate no seeds.

This sounds easy. Is it trust worthy?

I'm close to Westwood. Will check out. You're referring to the Westwood library?

Stockseed farms! They mainly supply native prairie plants but they have tons of both native and naturalized wildflowers too! Seeds are really cheap too! I can get a pound of bachelors button seeds for $10

Not OP but yes Westwood library has a seed section. Flowers, vegetables, etc. I got a bunch last year and plan to stop there this week for some more.

Yes. It's on the second floor. (https://www.westwoodlibrary.org/services/living-library/)

I'm doubtful Home Despot does much QA on native plants
They sold Purple loostrife in my local area for years knowing it was invasive

And I won't buy from them knowing how the corporation predominately donates money to the Republican party
Sorry / not really to bring up society and "politics"

Blue Stem Natives is amazing!

That is so cool! Yet another reason to support public libraries!

Look for any locally owned florist, vegetable farmstand or greenhouse closest to you.

In my experience they are more than helpful to find seeds of any kind and especially ones that are beneficial to pollinating your area.

Westwood library is also open on Sundays from 2-5 pm 🌻

I've tried both ways and I've decided that planting actual plants is much easier, albeit much more expensive, than seeds. Most large nurseries now sell a native plant brand and some natives are widely sold so if you do research there are more options than you'd think.

Thanks. This is a great idea. I don't know of any such place around me, but will keep an eye out.

Native plant trust/garden in the woods sells plants

I have ordered from Everwilde, they enable you to find seeds based on geographic location

Prairie moon nursery is a popular online native seed source. You can filter by region/state and pick germination code "A" for seeds that don't require cold stratification.

Make sure to do due diligence and pick a trustworthy source if you want native plants.

https://thetrustees.org/program/trustees-plant-sales/ has a number of native plant sales going on in the upcoming months if you want to buy physical plants instead of seeds.

SiteOne Landscape Supply

To your edit:
An easy way but probably not the best is to just stop mowing it. If you currently have a weed free, chemically enhanced lawn this might take a while. If it is your average lawn that just gets mowed, you probably already have native grasses and plants there. Clover, violet, dandelion, wood sorrel and many others are commonly growing in lawns unless treated as "weeds" and sprayed.

The best way to do it would be to dig up or rototill the entire area and prep it as a flower bed. The existing ground cover would most likely out compete the seeds sprinkled in the area, so removing it is important.

It's usually this ....

https://www.pennington.com/all-products/grass-seed/northeast-mix

If there is a local farmers market in your area you can ask the farm workers at any booth. They appreciate anyone planting pollinating plants and would love to talk and help you.