With orders of $25 or more, Amazon offers Prime members the Q-tips Cotton Swab 625-Count Box 3-Pack (1,875 total) for $6.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping.) That's the lowest total price we could find by $8. They're made of 100% pure cotton.

Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.