Ace sells it for around $4 a tube, Family Dollar about $1 a tube. It has to be a Family Dollar not a Dollar store. The Dollar stores don't sell it.
That reminds me, I am driving past a Family Dollar on my way hunting this evening,better pick up a few tubes on my way to the woods.
One thing I have noticed about Duco is they have changed the formula.
I use a plastic squeeze bottle full of Duco when I fletch arrows. In the past the glue got thicker over time in my bottle, now it gets thinner, to an almost water like consistency.