Originally Posted by SantaMonica
Try Ebay. There are thousands... but they'll take some work.
Only problem with ebay is the pumps aren't uniform so each additional pump you buy will have to be setup differently, which can become annoying.
Also, there aren't really thousands for sale, maybe 10-20 at any given point in time, and they are all bid-warred over
It would be wonderful if some aquarium-related company would cater to our needs and provide cheap (50-60$) pumps for us to use! Maybe we could do a huge group order and get some for APC? :P