Depending on how committed you are to getting one, you could try calling the number on this website:

Online Toy Site

They don't have them listed online, but this toy store is located near me, and I have seen at least one of the Dear America dolls there in the past couple of months. They went from having several to just one or two, so they might not have them anymore - worth a call though. I had my eye on them thinking they might go on sale, but they never did. They are about the price of an AG doll (at least they are at this store), so I could never bring myself to buy one.

It's a really nice toy store; I believe they have been one of the main online retailers for the Only Hearts Club dolls. This may have changed since Target started carrying the line though.

Another option, of course, is to search daily on E-bay. I've never seen one listed there, but I only check occasionally.

Good Luck!