I haven't been there, but been wanting to try Tipple & Rose in Princeton...tea shop that also sells tea

Teaberry's in Flemington. Their food is delicious, but pricey. I love their loose-leaf teas

Not Union County, but Delicious Orchards in Colts Neck has a good selection. Just disappointed they stopped carrying my favorite - Nepal Gold.

Kam Man asian grocery has some stuff, that's where I get my green jasmine and oolong from.

I used to frequent Teavana until Starbucks bought them out and pretty much shut em down. I've found some loose bulk teas on Amazon.

You can try local indian or asian grocery stores.

Nai the Tea Lady at Livingston Mall and Rockaway Mall

A bit far but will try to make it down there soon.

The TeaCompany in Montclair is pretty good IMO, but I’m not a connoisseur.