WoW ... The prices is so high for you guys !!!
In Iran we pay about 0.31$ per liter , I have a 32L , 10L and 3L dewar (my own).I refill it by myself. It cost nothing for us !!! We even drink it , pour it on each others , play with it ...
But I have to mention that the dewars cost so much , like 32L=1000 $ in my location.