The one from Cellar Tracker definitely looks like it's gonna cost you an arm and a leg. No prices posted and they want you to call or email so their sales team can contact you. Cool looking stuff though.
The La Crosse stuff looks like it has potential though. Here's the [ame="http://www.amazon.com/Crosse-Technology-TX60U-SET-Temperature-Humidity/dp/B003E46EU4/ref=sr_1_2?ie=UTF8&s=home-garden&qid=1304534468&sr=8-2"]Amazon.com: La Crosse Technology Weather Direct TX60U-SET Online Temperature and Humidity Wireless Alert System: Home & Garden@@AMEPARAM@@http://ecx.images-amazon.com/images/I/31K-FxIsSZL.@@AMEPARAM@@31K-FxIsSZL[/ame] to the Sensor/Gateway set ($54). You can have up to 20 sensor per gateway ($31/sensor). This info seems sketchy, their FAQ says anywhere from a couple to 10 depending on what else you have on the gateway, how often you are reporting, etc. The only thing that is disappointing to me is that the sensor's probe only monitors temp, not RH. The sensor itself monitors both, but it makes the 6-foot probe somewhat useless for our application. You monitor things through WeatherDirect.com for free. Email and Text alerts are free for a year($9.95/year or $19.95 for 3 years thereafter), but I'm not sure I'd ever really have a big use for them .
Data is stored once every 2 minutes and you can download spreadsheets to see how things are fluctuating. That is the biggest turn-on for me. I would love to be able to analyze things like this.
ETA: Only 30 days of storage for information, so if you want to monitor longer term, you would need to remember to pull the information on a regular basis.
I'm going to do some more digging, but I may have to pick one of these up. I do still hate that you can't calibrate it (at least that I've noticed yet...)