While some of the polos you can get a decent discount, the pocket polos are basically the same price (depending on size) on the parent site, but you save $5 w/prime or free shipping.
Climalite Pocket Polo
The engineered stripe polo is almost $10 cheaper (also depending on size) on the parent stripe plus prime shipping!
Climacool Engineered Stripe Polo
Not that many reviews on Amazon, but almost all positive.