You'll also want to have a look in our library.
Several articles there for people new to rebreathers,
as well as many of the units that are availabe.
Many of the manufacturers have prices listed on their
websites, from the little Sport Kiss (Jetsam) to the
mighty Ouroboros (Closed Circuit Research), with the
Megalodon (Innerspace) and PRISM (Steam Machines)
in between.
The latter, by the way, is made locally to you, outside
Lebanon, TN. You might just want to give them a call
and visit. Have done it many times when they were
still in CA a few years back.
Other than that, I also recommend to attend one of the
rebreather intros. Advanced Diving Magazine holds them
every once in a while around the country, most often
probably in Florida. Great experience, great fun.
Did several, you can find the article in the library.
Some manufacturers also have the instructors listed
on their website, and once you decided on a unit you
can always ask here for recommendations.