Here's a deal from my area:
Stern 2014 Mustang LE, (184 out of 500 made!!!!) $10,000 "NON-NEGOTIABLE" billed as a rare collector's item.
They want more than 1,500 over Stern's MSRP. I don't claim to be an expert on pinball prices but Stern literally just released this in April. Somehow, I don't think it's worth it especially when a quick search turns up that certified dealers are actually selling Mustang LE and the other Mustang models at below MSRP.

And the difference between the LE, Pro and Premium appear to be pretty much just different artwork, different music tracks and some other small modifications to the playfield. To get multiball jackpots you just...hit the car (which is huge) in the middle of the playfield. Just saying...

The same people appear to be selling a number of other common arcade and pinball games for somewhat over-inflated prices, at least in my opinion.