I guess it depends on how far you want to walk! There is tons of cheaper lodging everywhere around that town, but to stay within walking distance to save on parking fees ($10 per day!) at the center ~ here are your best options.
Adjacent to Convention Center:
Peabody Orlando (very very expensive!)
Rosen Centre Hotel
Rosen Plaza Hotel
2 blocks from Convention Center:
Best Western Plaza International
4 blocks from Convention Center:
Amerisuites Orlando/Convention Center
1/4 mile from Convention Center:
Hampton Inn Convention Center
Quality Inn Plaza
Sheraton World Resort
1/2 mile from Convention Center:
Embassy Suites International Drive Orlando South
Residence Inn Convention Center
Sierra Suites @ Pointe Orlando
Our company has a major trade show each November, and it is at the OCCC a lot of years. I looked up housing for the show we just had there, and these are the closest ones listed. Hope it helps. While there, you should make it a point to eat at Bahama Breeze ~ very yummy!