It is the time of the year again when quite a few of the airline associated online malls are offering double miles and/or bonuses based on dollar amount spend. Just received an email from American Airlines where they are offering 500 bonus miles for total purchases of $500 to $999.99, or 1000 miles for total purchases exceeding $1000. The link for this offer is https://www.aadvantageeshopping.com/HolidayConfirmationInterstitial2.aspx.
Some of the retailers are also offering double the number of usual miles. When I am making online purchases, I normally check what is the straight cash back rebate using EBates, Fatwallet Cash back, or BigCrumbs and then compare it to the airline malls. During the holidays and when the airline malls are offering threshold bonuses they are typically a better deal.