For less than $100, there is nothing you can do except learn from this. There would probably not be anything you could do if it was a few orders of magnitude larger either, so you are lucky.

Hacking is pervasive, but anonymous currencies are providing a more interesting target than sending spam or renting botnets. Generally, security is very poor everywhere but most people don't really notice. This is going to have to change at some point as more of our lives go online.