Please contact your local Acer headquarters to inquire about any regional plans or offers.
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I don't think there is an exchange program for used computer products unless you have a warranty and your computer needs repaired or replaced. You can purchase refurbished ones on ebay through the official Acer Store http://stores.ebay.com/Acer or you can post your own ad on an auction or classifieds site such as craigslist and see if anyone is willing to trade with you.