Walmart can be great, I’ve gotten a few of my favorite professional pieces from there. H&M offers some pretty good basics in a pinch but quality sometimes lacks. Old Navy also has nice clothes and constant sales running (their women’s line is great, don’t know as much about men’s).

As a general tip - wherever you go, check for coupons or discounts off google or their websites (incl. student discounts for anyone still in school). Signing up for emails can usually get you 10-20% off your order within an hour if you give your email and most of those work in-store and online. I’ve saved a lot of money from those last-minute desperate coupon searches!

Also look into capsule wardrobes. I don’t know if it’s as relevant to men’s clothing as women’s, but the idea is that you buy a limited set of basic staples with the intention of being able to pair each item with everything else. It’s a good way to get the most use of every item you have while limiting your costs and saving time putting together outfits.