When I used to go to AX and Disneyland, I know there were a lot of cheaper motels along Katella and Harbor, and all were within walking-distance of the ACC and the hotels in Convention Way.
You could check out places like: Alpine Motel, Jolly Roger Inn, Portofino Hotel, Desert Palms, etc. to name a few.
"This is your job. You want a clear conscience, go start a charity. But if you want your own photography business, and your cosplayer boss says you gotta go out there and take a photo-shoot, go out there, take it, come back to work, and say "DO YOU NEED ME TO DO IT AGAIN?!!"