and other basic frugal living tips at About.com Frugal Living. If you are just beginning a frugal lifestyle, this is a good basic list of strategies.
Check Your Receipt for Mistakes
Mis-rings are common and costly. Bring all receipt errors to the store's attention, and you may just get your mis-rung items for free!
This is one I continue to tackle. I find double rings on items a few times a month, although I've never gotten anything for free this way.