There are LOTS of hotels under $50, I dont see the problem. Someone else mentioned Ho Jos at the Maingate. Tripadvisor gives it pretty good ratings. There are some even cheaper. The one I mentioned above I booked when Orbitz had a $50 off sale, got 3 nights for less than $90 (including tax).
Pull up almost any site, there are plenty of choices under $50 a night off site. Orlando is a cheap city to stay in. I think I saw another hotel deal for money off your booking on another online site yesterday too.
Myself I would only go to Priceline and all these other ways if it was a expensive city like Miami or Ft. Lauderdale, especially during the winter or NYC or Calif etc. There are plenty of decent places under $50 to stay at.