USB Thermometer w/Linux support

[dmorin at lear.morinfamily.com (Duane Morin)]

I've become very concerned with the uneven heating in my house.  Worse so 
that when I put 3 different thermometers in my daughters room, right next 
to each other, they often differ by up to 2 degrees.

I'd like to get a thermometer set up that I can leave on all night and 
track just how cold her room gets.  So I was thinking somebody's gotta 
offer a simple USB thermometer that provides a feed I can grab.  

I checked xanboo, but they only really offer complete solutions for home 
automation that are more than I need.

I see references to "the cypress thermometer" (such as at 
tilp.info/thermometer.php) but I honestly can't find the actual hardware 
anyplace.  I can find drivers for the "starter kit", which apparently
includes a thermo, but I can't find the kit itself.

Almost all the other posts I found were several years old and dealing with 
serial-based devices.

Anybody know where I can snag a device like this without too much hassle 
(either in cost or in having to build the fool thing myself?)

Duane