Always eBay for this kind of thing http://www.ebay.co.uk/itm/Digital-SHT21-Humidity-And-Temperature-Sensor-Module-Replace-SHT11-SHT15-UK-CF-/272041588659?hash=

Always eBay for this kind of thing http://www.ebay.co.uk/itm/Digital-SHT21-Humidity-And-Temperature-Sensor-Module-Replace-SHT11-SHT15-UK-CF-/272041588659?hash=item3f56f137b3:g:SSgAAOSwcUBYLps5 http://www.ebay.co.uk/itm/Digital-SHT21-Humidity-And-Tempera... You can even get a knockoff Sparkfun board (well it's open source, so not exactly knockoff): http://www.ebay.com/itm/Breakout-HTU21D-Temperature-and-Humidity-Sensor-Module-Temperature-Sensor/162242594396 http://www.ebay.com/itm/Breakout-HTU21D-Temperature-and-Humi... I'd go for the first one though, it looks like it has a membrane cover and does all the level conversion for you (it's only 3V3 tolerant). For some reason the SHT7x is an order of magnitude more expensive, no idea why.