My mom goes through at least 10 little and big orange bottles a month. o_O It turned out that my dentist (and her husband) also are nutritionists on the side and regularly donate daily vitamins and supplements to the homeless. They love to reuse the bottles because it allows them to divide and give a set of pills to an individual (enough to last for a few weeks) rather than just dropping a whole bunch of pills at a shelter where it may or may not be distributed evenly.
Now we regularly give my dentists bags full of empty bottles where before my mom just tossed them. They really appreciate it and make good use out of them. =)
Maybe you can find someone who does similar work.