check I can fill your 5 lb CO2 cylinder at $2.50 per lb of liquid CO2.  At room temperature, I can get about 4 lbs in. Bring it in as cold as possible and I can get more into it.

reference If you have a larger cylinder (10+ lbs), I can pressurize your tank, but can get less close to “full” as size increases (still $2.50/lb).

their website  

****Your tank must be within 5 years of most recent hydraulic test date******