Flood of duo's and rare bits on e-bay

Has anyone noticed the flood of U.S. Duos on e-bay recently?
There has probably been eight so far along with someone who
sold a brand new one. What's been killing me though has been
the prices on them, around $250 for a used system... Crazy...
The was some guy last week who put a brand new in the box,
unopened duo that went for $430! Damn.

Bryan