The only sponge place I would trust is Swiss Tropical for foam sheets....for smaller sponge and sponge filter, any other aquatic store that offers sponge filter will be fine, ie jehmco, kensfish, angelsplus etc...... I wouldnt bother trying any other place for foam, I have shopped around and those are your best bets.... Ive killed tons awesome fishes trying to save money with sponge filters...and I tell you, the dead fish itself was worth more then the savings..... do whats right for the fish.. not whats cheap...my two cents...and if your looking for sponge-sponge (round colorful plastic type sponge) for beneficial bacterial growth in a sump system, try the dollar store....
