There are a lot of amigurumi (crocheted dolls) on Etsy, but while you can probably find dozens of Batman dolls, I don't think I've ever seen a Big Lebowski doll, or the Log Lady from Twin Peaks.
And that's why I'm totally in love with Hooked Hands' Etsy shop. She also has dolls from Daria, Mad Max, Moonrise Kingdom and even one of Eazy E. Of course, if you have something even more off-the-radar, she does state that she makes custom commissions as well.