I ordered an ebay one to try on my basic PID blower I'm making
http://www.ebay.co.uk/itm/K-Type-Thermocouple-Probe-Sensors-High-Precision-Temperature-2m-/271560868767?hash=item3f3a4a039f
At that price they're worth a go. There's one of for £1.98 at the minute, delivered.