Apple iPhone 3G / 3GS 3.5mm stereo earbuds With Mic And Send/End button $2.99 (7.98 shipped)

[RAMd®d]

I used those when I first got my 3GS and the mic is quite clear.

But I'd be surprised if those were actually Original, New, Authentic, and Apple gear. There's a lot of counterfeit junk out there.