instead of raffling off actual product, you could raffle off gift certificates. When the person uses this gift certificate to purchase from you, you could then donate a portion of that sale to CEG. The good thing about a gift certificate is that the buyer may end up buying more than say the $500, paying the difference of course, but then also becoming a nice loyal customer.
If you check out NECO, as was suggested above, they've been doing this quite frequently lately to raise funds for Cougarfest.
Unlimited amount of raffle tickets can be bought by each person. The tickets are purchased through paypal, and those buying tickets are able to see a list of who has bought tickets so far. I'm not sure what method they use to pick the winner, but I think it's worth checking into.
They may even approach you as a seller to participate in their raffles - they're especially hungry for vendors who sell car audio products right now.
I think it's a great idea. NECO has had great success with this.
