What a nice way to spend some of the summer holidays than to make a little Arcade Cabinet. For this project you will need:
1. Raspberry Pi (About £25)
2. A version of Linux, no need for any fluffy windows, boot it straight into MAME. Details here.
3. An old Monitor / TV (An adaptor if no HDMI)
4. Joystick of some sort. You can buy USB pads for next to nothing. (May also need a 4 way adaptor)
5. Some design ideas for the cabinet and materials. Or you can buy ready-made ones.
You can comfortably do this for £200 and if you do everything yourself and haggle at every step, I reckon it's possible to do it for £100. Way cheaper than the £600 you'd have to pay for a ready-made one. Plus you can change the games to whatever you fancy!
You'll be the envy of all your friends when they see your oh-so-cool Arcade machine!