Since we already have this topic going in the Carnival section...
Might as well throw my 2 cents in.
It is really going to depend on the date, and if it is a weekend or not. I just did a Hotels.com search for January 15, a Tuesday and it showed alot of the nicer hotels for under $300. Including the Caribe Hilton and Condado Plaza. There were some listed for much less.
Good luck Tom,