I found a cheapest place to buy Green filters.
http://www.amazon.com/s/ref=nb_ss_gw...en+filter+2247
I no longer recommend them. There have been a number of dramatic failures, including my old C32, where the pieces of rubber edge ended up inside my blower.
New one are suppose to be better, but the edges are still rubber vs. polyurethane - like K&N and BMC. Those will fail as well.



if it is what a deal..
