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I bought this on my last trip to the US from possibly the most amazing cookshop i've ever seen called Sur-la-table. It cost around US$30.
One thing I like about this unit is that the probe can show the internal temperture of the meat, but also the oven temperature (I found that my domestic oven thermostat is way out!). You can set alarms for both too which can be quite handy for bbq if you are adjusting the vents yourself.
Not seen then for sale here, but did manage to google this place that will ship to the UK from the US:
http://www.chefscatalog.com/product/253 ... et-85.aspx
Any questions, let me know