With Penn Valley's program you'll only pay about $12K-$15K tops if your indistrict & have completed a lot of your other PRE-Req's before starting the program, which I have done & I'm starting in their program this Spring.
I did look at NAU's program a few years back & if I recall for the Associates program they want at least around $40K-$50K & for the BSN program it was at least around $60K-$80K if I recall, & for the BSN program before any credits would transfer over. Also, first priority is only given to current NAU students especially for the ADN program according to the admissions rep that helped me out but the BSN program they'll still give you priority if your a transfer student but I guess that's why your paying 3x the cost. They also told me they take students in at a quicker rate as well.
We have some NAU students at our hospital & there instructors all seem really nice & funny when I have to work with the students but I've seen some of their students act a little too stuck-up & cocky but not all.
Anyways, best of luck to you
EDIT: Last time I checked both programs were credited regionally & nationally. The last program I looked at which was Concorde wasn't regionally credited if I recall, which means if you want to go on & get your BSN, it's very unlikely those credits will transfer. They even told me their credits would transfer to NAU; however, the admissions rep at NAU told me they wouldn't because of their non-accreditation. So, always do research before you start a program & fork out money like that.