Most laboratory sciences you'll need for a CRNA degree are NOT going to be offered online. It defeats the purpose.
You'll be training to give the same drugs an anesthesiologist does, they are not going to let you skimp on clinical time or get by with online classes.
You can find more info on becoming a CRNA and programs here:
http://www.nursefriendly.com/crna/
You'll need to plan on growing some roots and staying in one place were you can take classes for at least 2-3 years.
Andrew Lopez, RN
http://www.4nursing.com