Yuin are widely considered to make some of the best earbuds money can buy you. Yuin PK3 is their entry model, and for $35-$36 delivered it's a steal (next cheapest is probably $49 from Headphones.com.au).
If you're unconvinced, go check out some reviews at Amazon or Head-fi!
They're awesome ear buds, I bought a few of these at $50 as they aren't terribly durable, last around 2 years before developing some kind of defect. (Warranty is 1YR.)
I'm using Yuin PK2's now which have a somewhat improved sound, but I'd recommend the PK3's over ANYTHING for less than $100 unless you're after in-ears (which these are obviously not).
Most ear buds are hopeless (especially the Apple variety) but these are superb.