Below is a list of components you need for this introduction tutorial and where to buy them from. The most expensive is the MiniBee USB control board, but this will be the centre of all the PC control projects. Mini-Bee USB Board

USB Mini-Bee Board The hub of all the PC control projects, the USB Mini-Bee. You can buy it for £25 over at PC in CONTROL.
USB A to B Cable

USB A B Cable Standard USB A to B cable (the printer kind). Dont be fooled by thoes £15 ones at PC World, get the same cable for 90p (yes 90p!) at Ebuyer.
MES Lamp

MES Light Bulb A simple cheap MES (type E10) light bulb, anything from 3 to 6 volts should do the trick. Head over to Maplin and you can pick one up for around 79p.
MES Lamp Holder

MES Bulb Holder A MES (type E10) light bulb holder. Head over to Maplin and you can pick one up for around £1.39.
PP3 Battery Clip

PP3 Battery Clip A clip for easy connection to a 9V PP3 battery. Head over to Maplin and you can pick one up for around 49p.
PP3 9V Battery

PP3 9V Battery An everyday 9V PP3 battery. Sold at almost every shop in the world!... almost.
Electrical Wire

Electrical Wire A couple of feet of electrical wire will do the trick here, the small insulated 1 millimeter stuff available at electrical shops. Cheap and cheerfull is good here, check out Maplins selection.