http://www.kaymont.com/pages/cold-weather-balloons.cfm - have sent an enquiry to them. Their balloons turn up on ebay for about $30.
http://www.yunhuanelectronics.com/Meteo ... ctured.htm
http://www.alibaba.com/showroom/meteoro ... lloon.html
http://www.hydrometeoindustry.org/catal ... roduct.htm
http://www.scientificsales.com/Meteorol ... n-s/25.htm
Project to send a balloon into lower space with payload
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