Sony's probably your best bet. You can buy some really cheap personal-portable CD players nowadays, some in the $20 or so range, but if they were pocketknives they'd have 'PAKISTAN' stamped on 'em. Sonys come in a wide range of prices, functions, colors, and flavors, so you can probably find one that suits your tastes and wallet pretty easily.
I like Aiwa even better, but they don't seem to produce as many different models as Sony, and they're usually a little pricier.