If money is tight and you are willing to slow it down a bit, you can get a much better break on your tuition. By taking 7 credits or less through MCCCD you can be classified as an unclassified student, and you pay........gosh, I forget, but it's only a little over the instate tuition ($65/credit). It's ONLY once you go over 7 credits that they must classify you, and as out of state, and then you get hit with the $250+/credit that you're seeing.
Or, take your 7 credits through MCCCD and find somewhere else with cheaper tuition to take your remaining 7. Out of state, I mean. I was reading at my sister's school in WI (Fox Valley Tech) that out of state tuition for INTERNET classes at her school is the same as their instate tuition for internet classes (a little over $100/credit there). Beats $250. I'm not saying to go there necessarily, but maybe try and find an out of state school which offers internet classes (if that's something you feel you could hack) at a reasonable cost.
FTR, what isn't allowed is to take 7 credits at two different community colleges or universities in Arizona to get around the unclassified classification and rate hike, so that wouldn't work.
I'd heard that the RC doesn't offer them anymore, but I'm not 100% positive either.
Pima Medical Institute in Mesa offers a CNA course for $1000. 5-6 week programs. Includes books, uniform, tuition, CPR iirc, just about everything except maybe the physical, immunizations, etc.
Medical Services Company in Scottsdale: $750. That's what I have written in my notes; sorry don't know much more about them than that.
Shanti in Phoenix is said to sometimes offer the course free/reduced. I believe you have to meet their income guidelines, so not sure if you'd qualify or not.