I want to fit some leds in my car, where's the cheapest place to buy wire?

Try Wilko's at Clifton Moor.

They have some on a roll. It's white speaker wire that has a black stripe to indicate live but will more than be up to the job of LED's! Nice and cheap and you cut it yourself so you might just forget you cut 3 meters off an tell them it's 2 at the till....

Nice one Phil thanks m8