I've used Accessories4less.com and have purchased a refurbed AV Denon receiver. It was cheap and if memory serves, it was packaged in a plain brown box (vs the original manufacturer's packaging). Other than that, it was like 50% off of "new" pricing and worked fine.
I had no issues with the transaction, and they actually contacted me to follow up and make sure I was happy.
I was happy with the sale and the state of the equipment when it arrived. No issues there.
Now, as for the AV Receiver itself, it wasn't a high quality piece and I gave it away. I think my son-in-law law is still using it in his man cave.