I feel your pain!!!
We are staying at POP Sept 14-19 and I checked EVERY single swap and none had an opening. I PM'd three of the swaps and ask the person running it to add me to the alternate list and luckily, one opened up for me. I wish you the same luck!
I know how frustrating it is! I know they are first come, first served, but when you see people with two and three fridges and all you want is one, its really upsetting. I hope you find one.
(P.S... if you would also like a coffee maker, look for swaps that have a coffee maker too, and if you like a bigger fridge, check the size of the fridges for each swap before you are asked to be put on the waiting list. HTH!)