Appeal to the insurance company... Play the lottery. This totally sucks. Which is really bad because my step-dad had a prosthetic leg too, and where does it go after he passed on? I know everyone is different but would be nice if there was a way to recycle and make whatever tweaks are necessary to make those available to those where the insurance won't cover one!
Maybe open up a Kickstarter Crowd Source fund for it? If 10,000 SparkPeople each donated $1.00, you'd be up and dancing in no time!!