You can find one at any mall store. Dillards, Macy's, Target, Wal mart, Sears, JCPenney, Or many Online locations are available. Amazon is a great place too look
Yes, you can find those types of polos at stores like target or just orde them online to avoid the scavenger hunt. But if you just like buying at the store and not online then target is te place.
You can purchase the short sleeve pique polo shirt at Lacoste on the high end outlets. There are also places like amazon that you can find them for lower prices.