They appear on amazon.com, but not in a full color selection. Hit or miss with what you can get. (They've had purple and pink forever.) And no better price than direct from Thermoworks. They are a UK company, so no idea if they have sales channels elsewhere outside the US.
~ Scott ~
Blue Weber Performer + Craycort CI • Brick Red Weber One-Touch Platinum • Weber 26.75 Kettle • Akorn Kamado • ET 732 • Record-crushing ORANGE Thermapen • UDS In Progress