In October I'll be finishing up my Masters with American College of Education. (
www.ace.edu) Each course is $750 including fees. Each course is 5 weeks long, then either one or two weeks off and then the next course begins. You can take off a session up to five (maybe six) times during your program. I didn't take any off so I'm not 100% sure. You take one class at a time unless you request to take two and they approve it. Though I would not recommend two courses at a time other than the summer assuming you don't work in the summer. Next session starts August 22.
They do want you to be currently employed as several of the weekly assignments involve using your classroom so if you're not currently working I am not sure this program would work.
It's a lot of work, you write a paper every week in addition to readings and discussion posts. I'd estimate I spend about 12-18 hours per week on one course. It was definitely tough during the school year to keep up with the course work, especially during my daughter's travel volleyball season. But I have been making it work, and the cost is reasonable and you'll finish in less than 18 months even without doubling up on courses assuming you don't take any sessions off.
If you have any more questions about it, feel free to ask.