Suggestions on where to buy diabetic supplies online? [in USA, have insurance]

I’ve gotten my son’s diabetic supplies (test strips, pump suplies, etc.) online from Edgepark since he was diagnosed six years ago. But my insurance provider changed last September (my employer has a self-insured plan, and they picked a new TPA), and my copays for supplies from Edgepark have gone up a bit. (I still pay the same percent, but the new TPA has apparently negotiated worse prices.)

I want to shop around and see if I can find a supplier with better prices. But when you do a Google search for “diabetes supplies” or “medical supplies” way too many things come up, and it is sometimes hard to tell which are legitimate suppliers and which are some guy in his basement trying to sell off grandma’s glucose test strips without going through each link.

Does anyone have suggestions for alternative online suppliers I should check out?

Thanks!