Of course it is. Referring to their prices in general the word 'ridiculous' is a euphemism. Wouldn't bite in even if my life depended on it. I'd rather spend 30 minutes reading and flashing it on my own, which btw is doable by anyone who knows how to read and follow simple instructions.
https://redmine.replicant.us/projects/replicant/wiki/GalaxyS3I9300Installation
