Hydraulic power steering *can* cost less, but it's a roll-your-own proposition. Just search "Power Steering" in the deuce section and you'll find some great threads on the subject.
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Dan Martin
1988 M35A2C (USAF)
1945 M29C Weasel
Hillsboro, OR.
MVPA# 31124
MVCCO# 828
We shall not cease from exploration
and the end of all our exploring
will be to arrive where we started
and know the place for the first time
- T.S. Eliot
Do you need the air brake switch or the hydraulic brake switch? The hydraulic ones are everywhere for about $10.00. NAPA even has one for about that price. The air ones are closer to $40 and not as prevalent. I got one in the mail to me right now from OD Iron. I imagine places like Saturn and Memphis have them as well. I just didn't go looking.
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"If you didn't build it, you can't call it yours."
The Air-O-Matic is nice - you have full manual steering in the event of air loss. However, you will NOT get the boost that a full hydraulic p/s system will give.
That being said, I can drive one-handed with my Air-O-Matic if I desire.