im finding people all of the place in Bako now. I have a 5lb and a regulator. Let me check on the bottle though, it may be spoken for but if my buddy came up on one already i will give you a sweet deal
ive been getting it at Praxair. they have been charging me in the $8.50 range for 5#, and about $11.00 for 20#. i dont have a commercial account or anything so thats just full retail
I've been using Melo's. A 5# and 10# bottle of CO2 cost about the same to fill (~$12-15). They do not have a nitro/CO2 mix, but they do have argon/CO2, which is what I got last time; it was ~$13 for a 5# bottle (~20ft^3?).