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Do you mean things like GW's Bizarre Bazaar?

I've found that shop owners are willing to do almost anything for their customers, but since theyre job is to sell kits and run a business, things like this are few and far between. You could run an auction or have open trading. To motivate them for something like this you'll probably need 2 things.

1) Gauranteed revenue to the shop. Auction's are paid to the shop and the seller gets store credit. I'm not sure how to gaurantee revenue for open trading.

2) Gaurantee no extra work for the owners. They're busy enough as it is so someone in your community would need to step up, orhanize it and follow it through to completion. This is probably the toughest part to get going though.