Amazon's months-long effort to acquire One Medical is finished — for now, at least. The company has officially completed its $3.9 billion purchase, giving it a primary healthcare provider with in-person and virtual treatment as well as lab tests. The successful buyout isn't leading to any immediate changes in One Medical's services beyond a temporary $55 discount on a one-year membership (now $144), but Amazon said last July that it planned a "reinvention" of healthcare with the takeover.