[eMINTS] Airliner or CPS Chalkboard?

[Gail Worthy]

Hi Everyone,
I am considering purchasing either the airliner or a cps chalkboard.  I
already have a projector and a smartboard.  Can anyone give me advice
about either one.  I got $300 from our PTO and I know I can get the
chalkboard model for that.  Someone told me since I already have the other
equipment I can also get the interwriter for the same price. I am not sure
who to contact about the interwriter.  I have talked to the salesman for
the CPS Chalkboard.  Any help will be appreciated!
Thanks, 
Gail Worthy