Tom,

>  ... but it's going to be hard
>to find temperature compensated sensors for much less than $20 in small
>quantity.

I too am looking to build a barometer and a popular sensor seems to be the
Sensym SCX15AN which sells for $44.70 from Digikey!  Is there a cheaper
source that you know of for one of these?

ps. How is your PIC-based logic analyzer project coming?

Thanks,
--rob--