trying to purchase a game from Steam

This may be a silly question. I saw that Black Mirror 3 is on special at Steam for $1.99 still on Halloween Special at the moment so seeing I already have the first and second game, thought I'd purchase it. Thing is that every time I type it in and press Pay, the silly thing says I already own it - but I certainly don't!! Has anyone else had the same problem?

Woops, had another look at my library, and the thing is there, don't know how they put it in without me knowing! Just goes to show that I don't really use Steam very often and would have used GOG if I'd realised that they also had the game on special!

Glad you found it.

It's always a good idea to check both Steam and GOG before making a purchase - you can sometimes find better deals that way.