The 3310 is a lesser receiver than the 3808 as far internal components go. The only thing the 3310 does better is video upconversion, so it is not unusual to see the 3310 for less than the 3808 was ever/is offered for.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70