a while ago I posted a request for 40mm Air-Tites. I finally found them on Air-Tites web site. The 40mm are actually 40.6mm and are listed as H40.6 direct fit (without ring). Link below. These are reasonably priced at $.55 ea.

http://www.air-tites.com/Air-Tite_Direct_Fit_Coin_Holders.htm