Just checked istheranydeal and apparently the lowest its ever been is £6.39 from SilaGames, and is that price at the moment. Though I've never heard of them or used them, so not a clue if they are okay.
I guess it also could have been a bit cheaper from some dodgy key sites, but at the end of the day at £7.99 you're not gonna save a massive amount more if you wait ages.
Bought it on steam, can't seem to get into it
Bought it on steam, can't seem to get into it