Let me throw this out there as well, don't bet your life on what these places are paying as "tray price" either. You are a fool if you think any large retailer is actually paying the advertised tray price for them. When large companies buy goods, it is always a "negotiated" pricing contract, and no everyone is NOT treated equal.
That being said, I don't have a Microcenter close to me now. When I used to live in Huntington Beach there is one just off the 55 in Irvine I used to go to all the time, (as well as the Fry's in Fountain Valley off the 405) I love Microcenter, they do have some great deals.