Prices ?
Really hard question to answer without viewing the machine. Are they reconditioned, or have they been abused in the arcade for the last 10 years
I'm not a huge fan of TZ - So I'll leave that for the experts. The clock and gumball are the two points of interest.
G'N'Roses - Look or playfield wear around the AXL scoop and the center of the playfield. Check the Slash Ramp (Green one).
I don't think you will get either for under $3500 (including other expenses) at an auction, but you never know !