Today, Amazon local is having an amazing deal where you pay $5 and get a $10 giftcard that you can use either at Amazon.com or Amazon Local (a deal site like Groupon). To purchase go http://local.amazon.com/
Now the trick is, use a gmail account and create multiple accounts and for each account use different credit card numbers to purchase more than 1 giftcard. To use the same gmail account but register it at Amazon as different new accounts, just add a “.” (period) in between letters. For example, if your gmail address is email@example.com, by doing “firstname.lastname@example.org”, then another new account “email@example.com”, you will be able to open multtiple accounts under 1 email address. The terms are that you are allowed to purchase only 1 giftcard but by going through this method, you “should” be able to obtain more than 1. I just purchased 10 using 10 different accounts and credit cards.