Go on eBay and do an advanced search. Check the sold auctions and see what they are selling for.

I assume you meant, full bike without wheels. In that case- I would guess and say $2000

Looks like the going rate for a SC7.5 is about $2100 (+/- $300). With the upgrade, I would add another $500 to that. But that's for a full bike with wheels... honestly you may want to sell it a pair of training wheels... makes it much easier to sell and you will recoup the cost (unless you buy brand new wheels and slap them on!)

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"Suddenly the thought struck me. My floor is someone elses ceiling"-Nils Ferlin