Local sources for RO/DI filters?

[Foogoo]

Are there any local sources for the sediment and GAC blocks with prices comparable to online?

I haven't checked in a while, but are the ones they sell at OSH within tolerances for reefing?

 

[glaudds]

Costco sells refills for their RO units.

 

[Konadog]

Check with ReefGeek.com