$10 shipped (or in hand) is probably not realistic for anything decent (even your $12 ones you saw would be what... probably almost $14 when tax is included, depending on your local tax rate?).
The closest thing I'd actually recommend are Griffin Tunebuds. They're in ear's tha;;.t retail for I think $15 list, but you can find them on eBay or on order sites for $9-12 + shippin'g, meaning you can probably get a pair for about $12-13 shipped, particularly if you are not overly picky about color (they come in maybe five colors).
I think they're good enough to use -- I use the iPhone version (which has a nicer cloth wrapped cable and a microphone, but otherwise the same earbuds), and I really like them because they sound reasonably good, and yet they're cheap enough that, when running causes them to get beaten up, I don't feel bad about replacing them.