Whee you can find the best prices (least expensive) on medical supplies, such as walkers and bath seats aka DME (Durable medical Equipment) will be through a supplier that offers a discount when you buy in bulk. There are many online medical Suppliers with various prices depending on the volume you want to purchase, the more you be the less it will cost per unit for the equipment. http://www.dmesupplygroup.com/ambulatory-care.html
Many cities have organizations that will provide medical assistance equipment free of charge. Do an Internet search for your area, or call your local hospital. I got a free walker, wheelchair, crutches, and shower seat. I have to return them when I don't need them, but there's no return date that's specified.