Sourcing CO2 in a Tank

I looked into this recently and asked around with a couple restaurant owners I know. I was told big tank refill service exists but buying the tank was close to $10k. So I just bought the sodastream and plan to do the tank exchange via shipping to cdmx. Not cheap but cheaper than buying topo chico and using all that plastic.

Recently got pointed to this old thread on Facebook that makes it sound doable, but does involve some hoops and travel to Lazaro Cardenas. https://m.facebook.com/groups/244412430422092/permalink/779525886910741/?mibextid=Nif5oz