Go browse through the RockAuto catalog. When you get to your specific vehicle, there are 2 icons, one for an RSS feed, and one for bookmarking your vehicle's catalog. Click on the RSS icon, and the next page will have the choice to subscribe to the "bargain" parts as they go on sale.
You can also bookmark the bargains page directly by clicking on the RSS icon next to the text "Love A Bargain?" on the resulting page above.