We are doing the same thing in September -- one night before we check into BCV -- but are going through Priceline. With the incredible number of hotels in the area, you can get a great deal. You can choose your level (1*, 2*, 3*, etc)
Last 2 times we did this we got a basic 2* (or it may have been a 2.5*) hotel (La Quinta and Comfort Inn) on Irlo Bronson Highway for $28 and $32 and it included free continental breakfast. (Others may have had even cheaper results)
I haven't bid yet for our Sept trip but we'll do the same thing. I tried to get WDW AP rate but all the $64 rates were booked up.
If you haven't used Priceline, just know you pay in advance, no cancellations and you don't get to choose your hotel...but for only about $30, it's worth it!