Timing belt is Cambelt, correct - as said above, unless absolutely certain of what you are doing then take to garage.
Most garages can supply and fit for a little under a couple hundred. You need to make sure they do the tensioner as well, a lot of places'll just fit a belt unless you ask.
I got a kit from
http://www.buypartsby.co.uk for around 60quid - that came with tensioners etc. Local garage put it on, done an oil change and Mot (plus some other bits). Can't remember exactly, but the belt fitting and oil change was about £80...
This will be the same whether you have 1.6, 1.8 or 2.0 I4 - would eliminate guesswork if you'd have said in your post what engine etc...
Cheers