Smuckers Uncrustables are $2.16 at our local Wal-Mart. And that's only 4 sandwiches, so $0.54 each, and with four kids now able to eat them for lunch, they wouldn't last long. So, I've started doing something else instead. Freezing a regular PB & J for them, which isn't technically cooking ... but it's still bulk preparation.
Just put a slight slathering of the peanut butter on both sides of the bread, and then the jelly in-between. Then freeze! When you place it in their lunch, it will completely defrost by lunch and the peanut butter stops the jelly from making the sandwich all soggy. I can fit 16 in the side compartment of the freezer, and it makes the mornings so much easier on the busy days. :)
Cost Breakdown: 1 loaf of bread ($1), 1/4 of a peanut butter jar ($0.25 - I buy mine at $1 each when they are on sale), 1/2 of freezer jam ($0.50 - or round abouts) - $1.75 for 10 sandwiches, or $0.175 each! That's about a $0.36 savings for each sandwich, or $1.44 each time that I feed my kids these for lunch ... yeah! :)
As a side note, I made homemade freezer jam for these & my son has been begging for them every day as a result!