Where do you buy thermistors?

[Thrilla]

I want to make a modular thermometer, with switches to controll the display, it's basically changing the thermistor with a switch, so you can monitor different places with just one single display.

Anyways, anyone know where to buy those round triangle shaped blue (with light blue tip) thermistors and flat ones? And what ohms are they?

[dastt]

i found some at radioshack