Some of the car booters wanted crazy prices for things, there was the most yellowed amiga 500 I have ever seen, the keyboard looked like dog hair had been stuck on over layers of cola, the box was a soggy ripped mess, guy said " These fetch good money on Ebay boxed...I`ll take £50 for it !! "
Anyway, don`t know much about dreamcasts, not really my thing, to modern and too much 3d going on !! - might try to swap it for a nice C64 breadbin or something.