It can be difficult to find somewhat cheap foods on the Strip but it's possible. Hash House A Go Go offers extremely large brunch/lunch foods for about $15 per person. It's located upstairs at the Linq casino.
The food here is very standard brunch/lunch foods like waffles, pancakes, sandwiches (BLT, etc), salads, and so on. The food overall was pretty good, I thought. I ordered a combo plate and got a ridiculously large waffle, a lot of eggs, and large strips of bacon. I was quite pleased with the food and finished most of it. The plate was about $15 but I thought it was a lot of food!
The waffle was bigger than my face and was easily cut into four sections. I thought 1-2 of the sections was ample enough! But it was really thick and went well with the syrup.