Originally Posted by bigredseo
When we housed at a datacenter, we used to buy our equipment through them and piggyback on their orders to their larger suppliers to get the lowest priced deals.
We've purchased through supermicro dealers (that's nearly 15 years ago now), and had great experiences, but we always purchased fully built machines that had run through a burn-in time so that we could just plug-in and run. There's few things more frustrating than assembling things, running the burn-in and areas failing and having to wait on new parts.
Just reinforcing what bigredseo said - I used to run an RMA department for a networking firm and it's amazing how much hardware fails right out of the box.