[masraum]

In case anyone else is ever curious, here you go.

http://www.measurementcomputing.com/

It's battery powered and stand alone. The USB is only used to configure the thing and download the data.

# Stores 16,382 temperature reading measurements
# Supports -35 to +80 °C (+/- 1 °C accuracy)
# Supports sampling intervals of 10 sec, 1 m, 5 m, 30 m, 1 hr, 6 hrs, 12 hrs

$59

They also have a slightly cheaper $49 model, but the accuracy/precision is lower, the temp range is smaller, and the sampling intervals and memory is reduced.

There's also a $79 model that's the same as the above except that it also logs up to 16382 relative humidity samples.