Shame!

Keep your eye open for a parts machine on eBay with a busted screen/busted case/missing RAM/HD etc. and hope the logic board is good.

Don't bother with the 'sold as seen and untested' logic boards you find on eBay, it's odds on they're faulty. Sold as seen and untested is eBay speak for - this don't work. I would take a risk on some 'sold as seen' items (RAM for example) but not logic boards.

The only way I'd buy a logic board on eBay is if it's sold as 'tested as working' and has a DOA warranty on it.