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Petco and Amazon have Aquaclear filters for 50% off.

$ 20 Aquaclear 20: https://www.petco.com/shop/en/pet…-20-172855

https://www.amazon.com/AquaClear-…B000260FVG

$ 25 Aquaclear 30: https://www.petco.com/shop/en/pet…ter-165433

$ 30 Aquaclear: 50: https://www.petco.com/shop/en/pet…ter-165476