There is a non-working, untested FLASH for $150 in MD (dunno if that's the one you're referring to). Figure that you can get the boards straightened out, but you'll want the backglass and playfield to be relatively intact, cause you don't want to have to track them down later.
Not that this will help with value for FLASH, but I bought a non-working Strikes & Spares (late 70's Bally) for $200 a few months back as my first project pin. Some might say I overpaid, considering there was some PF wear and acid damage on the MPU. However, I was able to fix it, and sell it and turn a slight profit, so I came out ahead in cash and knowledge.
If you're just getting into pins, and want to get your feet wet with regard to repairs, pick it up, even if it costs a bit more than people suggest. That way, when a pin you want turns up, you'll have some experience that you can put to work.