When we went to Denver everywhere we went had an AHA discount, ranging from 10%, 15% even 20% off your bill (or your beer at least, most places we went we had drinks only). We probably saved 30-40$ in that 10 days alone.
I never remember to use it here at home because at my LHBS I get a discount for being a member of the local club who meets there at the store (10%, same as AHA) and at the local pubs I always forget to ask. I remember when I travel, but here at home.. nope.