My sister sent me a very interesting question that I bet many people ask themselves.
"What do you think I should do with all of my old baby bottles? Recycle? Donate? I hate to donate if they are technically not good for babies, you know? I'll have to look at them and see what # they are and if I can toss them in the bin. Such a shame!!"
I think I would try to keep the bottles out of the dump or recycling center as long as possible. Perhaps you could start with a local Freecycle group? Maybe someone like an artist or craft person can use them for another purpose? You can also go ahead and pass them onto another mom as long as you are clear about how you don't want to use them because of the BPA. Maybe there are moms who aren't worried about the BPA and would be happy to have some more baby bottles?
That is what I've done with similar situations. I gave away my plastic tupperware as well as my non-stick pan but told the person why I wasn't comfortable using them any longer. Some people will be willing to use it, and it still seems better than going in the landfill, doesn't it?
Here's another interesting question: What do you do when you see a mom using a baby bottle that you know is one of the types to leach BPA (such as an Avent bottle)? I've seen this a few times and wonder if the new moms are aware of the BPA problem. I never say anything though, since I respect not everyone is as worried about it. I also don't know how to say something constructive that wouldn't make the mom feel defensive or badly.