Argos do a very good one which saw me and several others through the IR. It's grey/black digital and hangs around your neck (if that's where you like it)
The price a year ago was something like £4.99.
The reference number on the box is 254/2535 and it's labelled "Stopwatch" and "Timer/Stopwatch".
Highly recommended (and I don't have shares in Argos!)