Today two new sensors arrived, I ordered a BMP085 barometric sensors and a HMC5883L magnetometer from eBay.
Their breakout boars are only half the size of the sparkfun versions. The mag is only 6mm by 6mm
baro and mag: tiny tiny
I am looking forward to test them this weekend, the will fit on the Flydusense V2 and everything will look tidy and polished.