chevrolux: I bought a bag of 50 RJ45 keystone modules from Aliexpress for about $30.
They are totally fine... didn't come with the PDL clips.. but hey are cheap anyway.
Reason I recommend buying the PDL ones is because you just can't go wrong that way. And I figure if you need to ask the question of where to buy from you dont know much about the product so the safer bet is better.
if they are a keystone, you could always use a PDL 619MKC module to clip them in to