Retail source for SuperMicro parts?

I'm building a server based on a Super Micro case and mobo for colocation. I have done okay with Newegg in getting most of the parts I need, but if I need something SuperMicro-specific that they don't carry, it's very hard to find in other places.

I have ordered a 1U heat sink (SNK-P0046P) from a local supplier, but it's on back order and they may not ever find one. I'm also looking for a front bezel (CSE-PTFB-813LB), and it's even harder to find. There are some dodgy online stores but they are perpetually "out of stock".

Any favourite sources for these things?