With all the stories I read on AVS about mainstream AVR's failing, I think a receiver is the LAST thing I would ever buy off Ebay. Even if it was from an authorized dealer with full warranty, who wants the hassle of having to box and ship it somewhere. Although I must admit, over the years I have had four Elite AVR's and no problems or malfunctions with any of them. Still, an AVR is far too complex a beast for me to buy without a factory warranty or faced with having to ship it for repairs.
If your looking for a deal, check out Best Buy or their Magolia stores in some select Best Buys for open box units. These will have full warranties and if for any reason something is not right with it, you have 30 days to return it. Easier to drive it back to the store for another one than to have to ship it somewhere. You can even scan individual Best Buy stores to see what open box units are in stock and the asking price.
Marantz PM15S2 LE, Oppo BDP-103, Simaudio Moon 100D DAC
VPI Traveler V2 with an Ortofon Rondo Blue and Simaudio Moon 110LP, Technics SL-1400 with an Audio Technica AT-14sa and Pro-ject Phono Box S
Dynaudio Focus 260's, Rel T-1 and a Panasonic TC-P54S1.