I picked up mine off someone on the board selling theirs, they come up from time to time. If you google on "aqualifter" you can find a few mail-order places but there may be a store in town. The only Canadian online vendor I could find listing them is Big Als -
http://www.bigalsonline.ca/BigAlsCA/...aqualifterpump
bulkreefsupply.com (one of the sponsors here) also has an economical peristaltic pump, think they call it the "Drew's Doser".