Consider Ebay,
I just installed my second one (bought from Aqua-Safe) and am perfectly happy. The first one lasted for over 3 years. I probably could have replaced all 5 filters and got it working again, but I got another unit with a 3 gallon pressurized reservior tank for a bit over $100.
I am local to TFP also, and they are way over-priced compared to Aqua-safe.
Cheers