don't know if this helps but me being asian n all i go to T&T a lot and i do mean a lot! anywho, sometimes they get pretty good deals at the end of the week and not to mention on their take out and sushi stuff usually goes on sale after 7 due to the need to toss not sold perishable items. On another note i signed up for their e mails for sales and coupons! if not you can always just visit their website and check out coupons or sales!
http://www.tnt-supermarket.com/en/index.php