Amazon offers its Prime members the Sentry HO470 Wooden Digital In-Ear Headphones for $6.96 with free shipping. (Non-members can spend $25 or more to bag free shipping; otherwise it adds $5.74.) That's a buck under the lowest total price we could find for a comparable pair of wooden in-ear headphones elsewhere. They feature a frequency response of 20Hz to 20kHz, 4-foot cord, 3.5mm plug, and more.

Of note, it's currently on backorder with an estimated shipping time of one to three weeks.