Another method that I am surprised no one mentioned is purchasing actual damaged or returned items from various auctions, here is a site (
http://www.liquidation.com) that is sistered with amazon and sells all their returns. If you're close to one I would strongly advise setting up an account (under an alias if you posses the ability, they check your id when you show up to pick up your winnings so ill leave figuring that part out up to you. If you have to use your real name nbd just use an amazon account with a different name) and purchasing some "salvaged" pallets with the items of your choice. They have almost everything you could think of at one point or another. If its sold and fulfilled by amazon, the returns are sold on this site.
Next order whatever you are going to refund from amazon (don't be a dick, make sure its SOLD and fulfilled by amazon) I sell on amazon and I will fawking go after people who I catch SEing just for GQ. When your item comes in from amazon take it out, swap over any identifying stickers from the new one to the damaged one and contact amazon. Your reasoning will have to differ depending on whats wrong with the item you purchased, damaged in transport, wont turn on. etc etc. It really doesn't matter when you are sending an item back. They will refund you.
Its worked well for me, kinda a little more involved but I have never had one issue returning a single thing, largest item was only a 3-400 USD but I have done quite a few.
note: Please be careful when removing the serial stickers off on items. If you don't have experience with a heat gun or have some sort of learning disability, practice on the damaged one first. If you botch the sticker pull the gigs up. Could probably send it back anyway but that's a level of risk I do not take with my accounts.