This came up on the BX24-AHT list. Here
is a quick easy looking environment monitoring setup that seems
like a quick set up http://www.froggyhome.com/. It costs
around US$60 for the top model that does Pressure, Temp, and Humidity.
Might be cheap, useful solution for those that don't want to build their own
kits, but want to get introduced to weather measurement. Probably
not intended for outdoor use since it is intended for 0 to 50 C, but
wouldn't look out of place in a den and hopefully it doesn't get that cold in