West Marin Pharmacy owner Zsuzsanna Biran has an idea that she believes could sustain her business while offering members of her Point Reyes community access to affordable medicine. The idea is a buying club—sort of. She envisions it working like this: Members would pay a monthly fee—say $38 per month—and in return receive discounts on certain medications—likely generic brands to start, and then adding more expensive names as more people sign on—as well as various…