Check out Rio Salado: http://www.riosalado.edu/Pages/default.aspx
It's a college based in the Phoenix metro. It's an accredited community college that has been doing online classes for years. Yes, there are labs included in these classes! A 4 cr. class will run you about $800 - not counting books. The U of MN proctors my exams. There are 2 - midterm & final. Multiple choice - 80 questions and 4 essays. The essays are fine since they are taken from a pool of questions that are shown to you each chapter (around 4 per chapter) so you can prep for them.
I've taken Bio 205 (Micro), Bio 201 (A&P1), and I'm currently taking Bio 202 (A&P2).
I'm on-call for work so these classes are flexible for me and work with my schedule.