a quick google - http://www.mulder-hardenberg.com/en/industrialautomation/data_loggers/sensors/documenten/Hobo_Sensors.pdf -
its industrial stuff so probably expensive
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Barometric Pressure Sensor - MPL115A1 - SEN-09602 - SparkFun Electronics - (they have this ones besides the BMP085)
DATASHEET: - http://www.sparkfun.com/datasheets/Sensors/Pressure/MPL115A1.pdf -
reading the comments brings me to
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http://www.futureelectronics.com/en/technologies/development-tools/analog-power/Pages/8762254-KITMPL115A1SPI.aspx -
which is a workable breakout box: guess it will be between $15-$20 (no promise
MPL115A1 Featuers:
Digitized pressure and temperature information together with programmed calibration coefficients for host micro use.
Factory Calibrated
50 kPa to 115 kPa Absolute Pressure
1 kPa Accuracy
2.375 V to 5.5 V Supply
Integrated ADC
SPI Interface
Monotonic Pressure and Temperature Data Outputs
Surface Mount RoHS Compliant Package
Just googling helps ...