Well, the
juice is less expensive than when I last looked at it too, and that makes a big difference.
If the cartos were $12.50/5, that's $2.50/ml
The blanks are 8.95/5 = $1.79 + ($2.95/5) $0.59 = $2.38/ml
So if juice stays on sale and cartos go back up but blanks stay down, then it's nearly parity.
You do a little better (1.79 + .38 = $2.17) if you buy 20ml at current pricing.
At current pricing, though, you have $1.99 vs 8.95 + 0.38 = $2.17 = If you stick with 20ml
So, yeah, right now, prices are near parity at 20ml but higher at 5ml + blanks.