The kit that you will need to buy to run retro games on a Raspberry Pi. The Pi itself, micro SD card, controller, case and power supply.
Part 2 is here:
• RetroPie: Emulation 101 - Configuring Retr...
Raspberry Pi B+
http://www.amazon.co.uk/Raspberry-Pi-...
PSU
http://www.amazon.co.uk/Raspberry-Pi-...
Micro SD 16GB
http://www.amazon.co.uk/Kingston-Tech...
Case
http://www.amazon.co.uk/NEW-Raspberry...
Controller
http://www.amazon.co.uk/CSL-gamepad-c...
Check out my other videos for more RetroPie guides
/ @floob