Yeah I'm going to have to get a heat slab because I turned the light off for two hrs and I picked him up and he was so cold his tummy was freezing it scared me.
Do yourself a favour and check Ebay, a lot of stuff is sold over Ebay that's designed for reptiles, and some of the bigger specialist reptile supply shops have a presence there.
Also don't let yourself be talked into buying a combined thermostat timer device - my experience with these is they are not as good as advertised and they'll drive you crazy programming them and responding to audible "beeping" alarms and they'll cost a lot of money.