Superauctions pricing and selection tend to be all over the board.
Last one I attended I bought.
Road Blasters. Excellent condition (but no sideart), perfect yoke, perfect overlay. $150
Atari Basketball. Rusty control panel, didn't come up. (had working 23" monitor, 2 working trackballs, and very clean boardset and manual inside). $5
Star Wars cockpit. Complete, maybe a "7" in condition. Monitor has glow, needs deflection work and slight work to the AR II board. Bought in parking lot. $150
At the same auction I also passed up (Mostly to avoid making 19 trips back to pick stuff up).
Several working 25" games in the $125 to $150 range.
Monaco GP mini (playing blind) $50
Nicest Capcom Bowling I have ever seen. In Gottlieb cabinet with perfect "bowling alley" laminate. $125
Complete but dead Atari Lemans (black and white driver). $5
Baby Pac, dead, no playfield glass. $50
Complete, fully working, decent condition Bombjack $50
Multi-Pac (yellow sides) $500 (pretty nice)
Atari Football $45 (dead, kind of smelled bad)
Decent Time Pilot upright $100
Decent Gyruss $125
Plenty of other stuff too.