BLUTEKUSA via Rakuten Shopping offers the Apple Earphones with Remote and Mic in White, model no. MB770G/B, for $6.28 with free shipping. (It's the second option.) Outside of the mention below, that's the lowest total price we could find by a buck, although we saw these for a buck less last month. These earphones feature a 3.5mm connector, in-line microphone, and 3-button remote.

A close price: All4Cellular has them for $4.49 via coupon code "A4C10" plus $2 for shipping.