Here’s the Raspberry Pi R3 PCB TH (Through-Hole) model fully populated.

The R3 board is shared on OSH Park which means you can order your own boards which you can assemble yourself!

Components

All parts are fairly common, specially the passives. Here are a few suppliers for the parts you may have a hard time finding.

ATTiny85

SparkFun: COM-09378 Mouser: 556-ATTINY85-20PU

Programming

You will need a way to program the ATTiny, I suggest getting yourself an Atmel AVR mkII, a Pocket AVR Programmer or if you already own an Arduino you can make an ArduinoISP.

LD33V

SparkFun: COM-00526 Mouser: 511-LD1117V33

TIP125

Mouser: 511-TIP125

PN2222

Adafruit: 756 Mouser: 512-PN2222ABU

Resources

OSH Park: http://oshpark.com/shared_projects/MmabtNcO