This might be new for FatWallet, but a $2-per-booking rebate for United and United Vacations has been available for years through both Ebates.com and uPromise.com (and the Citi Dividend Merchant Network and Chase Rewards Plus, for those using either of those programs).

2% would obviously be better, but hey, $2 is $2. (BTW, I've had trouble getting these rebates when using a Mac or Linux, or any non-IE browser on a PC, because apparently the automatic reporting back to the rebate site [i.e. FatWallet, Ebates, etc.] relies on a cookie that doesn't work properly except on Windows IE. Just FYI.)