Amazon offers Prime members the Elmers Disappearing Purple School Glue Stick 60-Pack for $15.87 with free shipping. (Non-members can check out via Subscribe & Save to bag free shipping, but be sure to cancel your subscription once your order ships.) That's tied with our mention from two weeks ago as 26 cents per glue stick, and the lowest price we could find for this quantity by $2. It's washable and non-toxic, and this quantity should last most grade-schoolers through the first semester.