So many of the coupons for Home Depot will state that they can be used at Lowe's.  I've had more than one Lowe's manager tell me NOT SO.  They will honor an advertised price in the newspaper but not their coupons.  In the future I am trying to always use the correct coupon printed for the store I'm going to.  It would be nice if these vendors would stop this kind of advertising and I'm sure Lowe's would appreciate it also.