H&M at Westfarms is a good bet. They have plenty of button downs, ones meant for tucking in and untucked, and tons of pants that are acceptable in a professional setting.

Obviously won’t be the highest quality but I have two suits from there which I’ve gotten plenty of compliments on despite them being dirt cheap. Also don’t be afraid to snag a pair of pants you really like and go get them hemmed if need be. A lot of places will do it for $10~$20

Express also has plenty of business appropriate attire although you will see a price hike over H&M as you’re paying for higher quality. Feel free to PM me if you have any questions, or always take a look at r/malefashionadvice. Most people there are extremely friendly and helpful. Best of luck