I try to keep Polos at $20 or less... Van Heusen Outlet is excellent, sometimes I can find deals at Kohl's. PGATSS Pebble Beach and PGA branded shirts are also both nice.
I mostly wear them for work though. I'm a muni or reasonable cost (less than $20/9 holes) private course guy and most often play golf with a moisture wicking tee and Van Heusen golf shorts.
Paying full retail for golf brand polos is a lot of money...
I don’t have a favorite brand. Whatever catches my eye that I can find at Ross Stores for 15 bucks usually. I will on occasion pick up a branded polo at a pro shop