With orders of $25 or more, Amazon offers the Avery Permanent Glue Stic 18-Pack for $2.34. Plus, Amazon Prime members bag free shipping. (Non-members can spend $35 to qualify for free shipping.) That's the lowest price we could find by $5. This washable glue is non-toxic and acid-free.
Note that this item is part of Amazon's "add-on" program and can only be purchased with an order of $25 or more. It's expected to ship in one to two months.