Also available is this 3.5mm Male to 2.5mm Female Earphone Plug Adapter for $1.79 before the above coupon, 39 cents after. With free shipping, that's tied with last month's mention and the lowest total price we could find for such an adapter by a buck. It allows you to plug a 2.5mm earphone cord into a 3.5mm jack. Coupon expires after 500 uses.
Expect these items to take two to three weeks to arrive.