Many of you may already know this, but I thought some of the newer folks might appreciate the head's up.
There are several boxes of Go Picnics that are gluten-free and Target sells a wide variety of them. If you're walking through the store and you notice they're on sale (in my area the regular price is $3.99/box) grab two boxes. Then go buy them - for some reason buying two will set off the coupon sensor at the register for another set of two.
For example, my Target had them at $2.99/box. So I bought two boxes. The receipt came out with a coupon for $1.50 off two boxes (which takes the price down to $4.50 for two boxes). Then you can lather, rinse, repeat the process until you're stocked up. Because I have kids that can use these like "lunchables" I keep a bunch on hand and generally do thise process about four times in a row. The cashier usually finds in funny and I have no issue taking an extra ten minutes out of my day to save money. Yes, I buy them, get my coupon, walk back to get more, buy them, get my coupon, etc.
Enjoy! And make sure you only get the gluten-free boxes - like I said, they aren't all safe gluten-free.