The discussion mentioned Bangai O being rather expensive.
Since I own the game, I checked it out on eBay and it can go for like $60.
I bought it not too long ago (or traded) for not a whole lot.
Pretty happy about that
Turbo Express w/ 5 and car power adaptor games for $30 - sold 4 of the 5 for $30 *free*
Picked up a SegaCD and 32x for free, then even traded the SegaCD with my Gen for a CDX with box, inst, pack-ins complete. Then sold the 32x for like $10 (I felt a little dirty after selling the 32x)
PS1 left at my house, *free*
JB Harold Murder Club for TG-CD. It was a Japanese release version and since the inst were so thick, it was in a double jewel case. The owner thought that is was missing the second CD, so sold it for $5...the game is 100% in English and Japanese.
10 unopened copies of Galaga 88 for Turbo from a flea market for $35. I sold 7 on a listserv for $5 each(back in the day), cleared my original cost and gave two to my firends and one for me. Everyone was a winner!
But the best IMO, I picked up Galaxy Maiden Saphire for TG-CD (ACD) used from Japan for $50...remember Japanese used is like American new. This shit sells for $200+ still today.