Found this awesome promotions, discount and "groupon" website for Thailand called Ensogo.
Just thought i'd let ya'll know, you can check out the Ensogo food & restaurant section here.
There's quite a lot of 50% off discounts, I just bought 1 for Balee Laos restaurant. But make sure you check the terms of services bcos some have some rules like "no beverages included" on some cash vouchers.