Prep Genrl need some new filters

[Turret Buster]

Hi guys. My gas mask filters have all expired. I have 3 M 40's, and 2 SR 200 masks (all 40 mm threads) and need 2 good filters each - type 80, C3A1, whatever I can afford.
Where do you all get yours? Thanks.

 

[Turret Buster]

FYI, I found 4 Mestels on ebay that expire in 2018. I look forward to picking up another 4 as soon as the NBC budget allows it.