Cheap source for bauer filter cartridges

[scubaboat]

I have a 4 stage bauer 9.2 CFM compressor set up with a Nuvair Nitrox membrane system and make my own filters up consisting of hopcalite, molecular sieve and charcoal, these are identical to the ones you buy and pay big bucks for except it costs me about 5 bucks to make, I buy the hopcalite, molecular sieve and charcoal from Jordair in Vancouver BC