For American Express cardholders, American Express offers a $5 statement credit when you spend $25 or more at Dollar Tree, via the Twitter #hashtag "#AmexDollarTree. That's the first such statement credit we've seen for Dollar Tree via American Express in almost two years. Limit one registration per customer. Sync and purchase must be made by May 31.

Note that if you haven't yet synched your American Express and Twitter accounts, you will need to do that first. Click here to get started.