Nööb questions.How cheap can this game get ? Etc..

I'm planning to start this game. I know I shouldn't. I know I will probably get destroyed and stop playing after a week or two. Right now the game is 7 something €. But is it possible that it will ever get cheaper than this (like.. for free?). Should I wait or should I buy it.

Also, is it a terrible idea to play this game with steam controller?