If you do the math - you will find that the 60mg is cheaper and better bang for the buck than the 100mg with a 120ml bottle.
Err, where you lookin' at?
Wizard Labs:
60mg, 120ml (7200mg total nic): 11.39
11.39 / 7200ml = .1581944(...) cents/mg
100mg, 120ml (12000mg total nic): 15.99
15.99 / 12000 =
.13325 cents/mg <-- cheaper
...and then there's Nude Nicotine:
60mg, 120ml (7200mg total): 16.00
16.00 / 7200 = .22222(...) cents/mg
100mg, 120ml (12000 mg total): 19.00
19.00 / 12000 =
.158333(...) cents/mg <-- cheaper
...so, from either of the two vendors mentioned in this thread, it's cheaper to buy the 100mg/ml nic than it is for 60mg/ml. The only way it's cheaper is if you're comparing the 60mg
from Wizard Labs (.1581 c/mg) to the 100mg
from Nude Nicotine (.1583 c/mg), but that would be a pretty meaningless comparison since they come from two different suppliers, and even so it's only a two ten-thousandths of a cent per milligram difference.