FYI, I got this response from a nice person on the Budget Board:
"I don't know if HT10 is still good, but try it, it's 10% off. I last used it in January of this year.
Alternately, if you're spending enough money there, make sure you get their frequent shopper card- I believe you get 15% off a purchase if you get the whole card filled (I think it's 10 punches or $100 spent.)
Seven shirts would definitely more than cover that...you could probably have them ring up some first to get your card full and then take the discount on the rest."