I would look into a used bike as has been suggested. One possibility is that bike shops sometimes have used bike available. Perhaps bikes they have taken in on trade or rental bikes. In this case, the bike shop can be very helpful in picking the right size for you which should be just about the most important consideration. It costs nothing to walk into a bike shop to ask. It may also happen they have a suitable new bike they are desperate to sell and you'd be doing them a favor.