DMed you a link cause I need to buy some myself and I don’t want them selling out before I get the cash 
. 250 dollar sanitary stainless trclamp solvent tank
Don’t share the link for two weeks so I can buy two more ! Lol
its a great deal. how many actual lbs of butane does it hold? the 20 lbs is likely water.
in some ways coid may not be bad- some chinese companies are hurting and offering deals it looks .
It’s the same sizes of a standard propane tank 21 ish liters I believe
You are definitely right tho , i leave my tanks on the porch incase they leak , but you can just store in a dot tank and then move it to the sanitary tank and do a distill on the gas and you’ll be all set