If anyone wants to be super cheap and doesn't mind a shared bathroom/bedroom, and you are traveling alone, you might want to check the hostels that are close. I don't think this would be great if you cosplay is super complicated/has lots of make up, but if its simple/easy to change into, you might like it.
It's not for me (i need a place i can put on make up) but might be for you. I'd do it otherwise.
Attending This Year
No Brand Con '13
Marceline (Adventure Time)-done
Shaak Ti (Star Wars)-working on
Lady Loki (maaaaaybe)