There currently is an American Express offer of a one time $15 statement credit off a $75 cumulative purchase at Home Depot by June 30, 2014. Registration is required.
My preferred method for registering is to tweet #AmexHomeDepot through your American Express synced twitter accounts. Each authorized user on each account is eligible for these offers if you tweet from each separate synced account. You can also load it through americanexpress.com, and click on “Offers for You”. I installed the TweetDeck plugin for Chrome and have loaded all my Twitter accounts so that I can tweet one time for all accounts.
You certainly could use this offer to purchase Home Depot gift cards. However, I always try to use these deals on items that I’m already purchasing in order to maximize savings. At Home Depot, there is a gift card aisle. My Home Depot carries gas gift cards from Shell and Esso in denominations of $25 and $50. These gas gift card purchases (and any other gift card purchase) count as a purchase for this promotion.
The best part is you can go through the self checkout to do this transaction which makes using multiple cards for multiple transaction painless and easy.
There is a Shell station nearby where I live and therefore I will be purchasing over $1000 in gas gift cards in order to save 20% off gas this summer.