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Penn-Plax Aquarium Cascade 1000 Canister Filter for aquariums up to 100 gallons $ 49.35 at Amazon after the $ 15.59 coupon on the product page.

This is quite a good price for a decent canister filter and would be a great upgrade for anyone with a hang-on-back filter.

Some canister filter tips from the experts:
– For additional filtration power, fill the media baskets with good biological media like biomax, bio rings or sponges. (or for a cheap DIY alternative, try those cheap nylon pot scrubbers you can find at the dollar stores!) Activated carbon is an alternative for chemical filtration, though some hobbyists debate it’s efficacy. Save money by buying it loose and bagging it yourself.