We have tons of sizes of sponge filters. We import everything ourselves. We have suction cup style with 2 sponge filters both small and large We have base style from small to super large. Newest style is the XY-2838 for up to 220 gals. Prices start at $3 to $20 for singles. Contact for pre-orders, we also do bulk orders for wholes costs. We will match or beat anyone's prices.