AGREED they just arent nearly as good...

I once tried to re-fill a store bought used one that wasnt working anymore, and when I hooked it up and ran it after spending $125 on Pellitized carbon.

I tore it down because it wasnt nearly as good...

Check this out..

HTGSUPPLY.com $209.00 for a 6 inch can fan and 420 CF Goblin.. PROBALLY all you need...

Plus that is tha cheapest price anywhere...