Here's Dave:
http://www.wcf.com/co2iron/
500th System special! In celebration of our 500th system sale (more than any other system in the USA), we offer:
6 Eheim diffusors and 6 Fabco needle valves for $200 postpaid
Save 33%, add compressed CO2 to your other tanks. And we will include 60 feet of PVC thick-wall tubing, good for CO2, and 6 tee adaptors to let you complete your system easily. No manifold needed.
No affiliation, I bought my CO2 stuff from him years ago.