Snail Instruments: I got my MP3 chip from here. About 2.5 weeks shipping time, from the Czech Republic. I also ordered the adapter board from here too. Unfortunately the seller forgot to include this, so I had to wait another 2.5 weeks before I could mount my MP3 chip.
Digikey: Huge selection of parts! Too bad I need to pay for shipping.
Jameco: Somewhat limited selection compared to Digikey, but they are local so you can skip out on shipping.