Feel free to close this if it's been duplicated elsewhere (I did do a search and didn't find anything on this particular topic).
Ice over at ToysNBricks suggested I go to the Client Services desk at my local mall. They have free coupon books for various vendors and among them, the LEGO store: $5 off a $50+ purchase. So I happily used it and they cheerfully accepted.
Fine Print: Limit 1 per transaction, not applicable on sale items. Going to see if I can get another coupon book tomorrow.
Just putting this out there to see if other malls have a similar service.