Installed a
KW-AV70BT 2-DIN AV RECEIVER from Amazon for about $370, also picked up the audio/video cable for Apple products. Used AMEX reward points, so it was free to me (sort of). Installed, but will need to do the whip mod (damn antenna motor).
For speakers, I picked up a complete second generation Scion tC speaker set from some one replacing their stock system for next to nothing (~$10). It included 6.5" and 5.25" woofers, as well as 1" tweeters. Scion sourced all the speakers from the Lexus LX -- perfect for a bare bones budget build. Guys on the Scion sites say you can put external amps (50 rms +, according to one guy) on these things before they start to fade. Also included some 6x9s, but they won't fit the third gen without moving some serious metal. Anyway... what a steal!
Also got some Dynamat on order for the doors and rear cargo area. Bought it in bulk so it would be cheaper... I actually bought two trunk mat kits because per sq ft it was cheaper. Probably only needed one kit, as I'm only planning on doing the doors and the rear cargo area. I think this stuff is thicker, and thus, heavier. Oh well, more on that when I actually unbox it and get to work.