Wow i thought it would be more accessible then that. There are several locations in Clarksville you can walk in with a NOS tank have them fill it and 5-10 mins later your on your way, just assumed some place existed like that for Co2 as well.
The reason i ask is because i have exactly that, bottles i used for NOS back in the day and some of them are not your standard size bottles. Kinda hard to put a 5lb bottle on a motorcycle, so i have a few shinny polished 1lb bottles i would like to get filled.
thanks for the suggestions i will do some calling around and see what i can come up with.