CUDA! I spoke with jmhappycowboy (forum member) and told him about you having trouble finding just filters. He told me to let you know that you can get them on EggBid.com. He mentioned one other source, but I forget. You might PM him and he will be glad to tell you where he gets them! I googled it earlier with no success even when I tried Bio-filters. Hope you find them for a great price!