ecost/Dakmart/PC Mall are all authorized Denon etailers and they present the equipment differently on their websites. With ecost, it is pretty evident if a unit is available. Dakmart simply displays every model whether available or not in the hopes that you'll order something. Then they'll keep you on the string until something shows up.
I suspect they sell from a common Denon warehouse. If one has it, they all do. The equipment comes in groups. When Denon has some, they make them available. You need to check back often. You also need to act quickly when the model you want shows up. I can't remember, over the last year, when there were any 3803s available.
Having said all of the above, I got a DVM-4800 from ecost in November at a 74% discount from the $1199 MSRP. I saw the DVD-3800 at similar savings. The equipment, when available, is usually an excellent buy. It just doesn't come available as often as you might like.
