Where can i find 40mm or 60mm gas mask filters?

i have a finish gas mask, and the adapter for 40mm filters. where can i get some cheap filters?Where can i find 40mm or 60mm gas mask filters?
http://cgi.ebay.com/Lot-Of-5-New-Militar鈥?/a>





There are a ton on Ebay. You are looking for C2 or C2A1 canisters. All NATO canisters are 40mm.Where can i find 40mm or 60mm gas mask filters?
Most Military Surplus stores will have or can order them.
Ebay?

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