OK, I just saw the ad today when we went for ice cream.  Sonic on Bay Area Blvd. is doing half priced cheeseburgers on Monday, March 17 to celebrate St. Patrick's Day!  Sounds like a pretty good deal.  I think they are usually $3.50 or so, so half of that, saves you $$.  Now, if you are reading this post and it's past March 17, that's ok.  This location also sells cheeseburgers half price every Tuesday after 5pm.