I’d recommend ordering a larger CO2 tank. I use a 20 lb tank (which is about 9kg in the rest of the universe, I guess), so I have to change out tanks MUCH less frequently (maybe every 2 years or so). Of course, my tank is external to my kegerator, so storage size isn’t an issue.
Agreed with larger, but also check with whoever your gas supplier is before buying one. Often they simply exchange empty for full, and the deposit for not having an empty may be less than buying new. Then you dont have to say goodby to your shiny new tank…
As a side note, I’m strongly considering selling my entire keg system. Two perlick kegerator and 7 empties. I dont mind the bottling process, and I feel I have better control over carbonation. Kegging has too many moving parts and possible infection points for me. Plus lately about 50% of my beers are sours, so I run the kegs empty and they sit for 4-6 months… when I go back to brewing normal beer, at two batches a month it takes a while to get 7 kegs full again.