Here are some of my favorites. They may not necessarily be the cheapest possibilities, but they were all really good and very filling dinners. I do also have the TIW card so for all meals mentioned, that 20% discount is included in my totals.
Sanaa -- I did dine with friends so I had someone to split the bread service with. Naan is very filling. I ordered the tomato soup with paneer and the salad sampler. That was a very satisfying dinner for around $20. I once over-ordered and added a side of saag paneer to the meal. It meant I brought back most of the salads for breakfast the next morning.
Kouzzina -- It started with the lemon chicken soup for an appetizer. Then I made a main course out of a couple of sides -- the amazing brussels sprouts and the orzo. This meal came to around $21. Again, in the past I've over-ordered and included a side of gigante beans. It was waaaay too much food.
Todd English's bluezoo -- WHAT???? How can it be??? The key here is the bar menu. A few weeks ago, I dined at the bar and had a nonalcoholic specialty drink (the overpriced overordering mistake), the roasted beet salad appetizer, and the overwhelmingly huge but oh-so-good crab nachos. Even with that drink in the mix, My total with discount, tax, & gratuity came to less than $30. And I had 2/3 of the nachos to bring back to the room and pick on for breakfast the next morning. The nachos are extremely filling and rich (all that butter-poached crabmeat) and only $13. It really would have been better if I'd had someone to split them with, but I was craving them so I ordered them even though I was solo and knew it was going to be far too much food. Bluezoo used to have a fantastic happy hour deal of $5 crabless nachos and flatbreads, but that was discontinued a while ago.