Unfortunately, no. I started using iStopMotion after I got tired of dealing with FrameByFrame, but right now it's like $50 on the Mac App Store. I was able to buy it on sale for either $30 or $20 around Christmas time but I'm not sure if they'll do that same sale again this comig Christmas. The thing is, I can't buy software from other sites other than the Mac App Store because I'm able to go to a local supermarket an buy an iTunes gift card with cash and then use that to buy software online. So if you can't buy software with a credit card, you might consider buying an iTunes gift card locally.
There's also one application called I Can Animate that is not free. However, I have the trial version and I can't seem to find any limitations except that it'll ask you to upgrade everytime you launch the app.