I think that's where I'm going to get mine. But, if every dollar counts, theirs is cheaper by the gallon than buying four liters. I have about 1.5 liters in hand. I figure the addition of a gallon would pretty much set me up for life, especially since I've reduced my levels a lot and I'm an old fart.
If I live long enough to exhaust 5+ liters of 100mg, I'll get over it, LOL.
You're right, @ regular price it is cheaper by 2 cents/oz when you buy the gallon. I personally am not interested in dealing with gallon jugs. But it's the most economical.
Now when they have their sales (like yesterday) for $10 off per liter or gallon, it's cheaper by the liter. You save 13 cents/oz., if my math is correct.
I never buy at regular price so I never paid that much attention
My total nicotine stash comes to $34/liter.