LA County/Southbay Locations In alphabetical order according to City.
----------------------------------------------
Airgas West
10675 Van Owen Street,
Burbank, CA 91505-1136
818-760-1200
Onsite Refills:
10# swap - $21
20# swap - $29
----------------------------------------------
Liquorland
928 E Covina Blvd.
Covina, CA 91724
626-966-6388
Onsite Refills:
5# refill - $8
Others - call for info
----------------------------------------------
Airgas West
11663 W. Jefferson Blvd.,
Culver City, CA 90230-6334
310-823-7442
Onsite Refills:
10# swap - $25
20# swap - $35
----------------------------------------------
1. Steinfillers in Long Beach:
Stein Fillers - Home
Its the homebrew store that I use for my beer making supplies. They also sell new empty CO2 cylinders at reasonable prices and I have traded in empty cylinders here as well from my tanks. Cost was approx $12 for 5lbs trade-in.
2. Sims Welding Supply Co. in Long Beach, Gardena, Wilmington, Culver City, Fontana, Sylmar, and Anaheim.
Sims Welding Supply
I haven't been there personally but some others have. I don't know prices but have heard around $10-15 for 5lb swap out.
----------------------------------------------
CO2 Cylinders & Refills--Locations and info. 
Threaded Mode
