Some of my better scores:
Magical Chase, US version, complete, $165
Terra Cresta II, JP version, new/sealed, $70
Beyond Shadowgate, US version, complete, $75 (got the game sans manual for $70, picked the manual up later for $5)
SuperGrafx console, JP version, $60
Terraforming, US version, complete, $45
RAU-30 SuperGrafx CD-ROM^2 adapter, JP version, new/sealed, $20 (thanks HK seller who doesn't know English!)
Samurai Ghost, US version, complete, $9 (got the cart loose for $9, got the manual later for free)
And then basically all the multitudes of games I bought new/sealed from TZD over the years for $10-$30, including Bonk 3 back in '95.