Try Arizonia Instruments - I've used them for years with great results. (Not affiliation - just a happy end user)
You can pick up used units on Ebay or other web sites if you look around. http://www.azic.com/
It is hardly too strong to say that the Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern well, but they mean to govern. They promise to be good masters, but they mean to be masters.”
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