You might also check ecost (authorized Denon etailer). They handle the sales of the units Denon refurbishes and at great savings. I'v purchased three uniyts from them and my friends several more.. Stock comes & goes quickly based on whatever Denon ships them, so if you decide to buy from them, don't dawdle.

Several threads reference ecost & buying experiences here. They show the price of the 4308 @ $1399 and the 3808 @ $799, but they are both out of stock right now.