V.D.
It's really not a good idea. Cost aside, a group plan is your best option. By law, you are covered from group plan to group plan. Should your husband change jobs, the next group plan has to carry you. They must cover pre-existing conditions and they can't they drop you or raise only your rates because of any medical issues. Even if you don't have any pre-existing conditions and you switch to independent insurance, should you or someone in your family get sick, you can be faced with with outrageous premiums and have a great deal of difficulty when trying to find a new carrier. If you stick to group insurance you will remain covered. I would talk to your HR director about your options and about ramifications should you decide to leave.
How about re-visiting your car & homeowners insurance? Refinancing your mortgage? There are other ways to save money. Health insurance shouldn't be the area that you focus on.
Good luck!