Wired Gadget Lab:

Amazon is offering surprisingly high bounties for used iPads, proving that even the bottom feeders of Apple’s tablet line-up still generate significant public interest.As at press time [sic], Amazon’s partner merchants were offering as much as $500 for a like-new iPad 2 with 3G or $320 for a first-gen iPad, depending on features and conditions. The used devices are typically either refurbished or sold as-is, often through Amazon. Sellers don’t receive cash, but rather store credit — a nice way for Amazon to ensure it retains you as a customer, and benefits more than once from the buy-back transaction.