I have a few crates in my inventory that I would like to open. I wondered if it was possible to have a pack of keys? I am not talking about trading. I'm talking about one item that gives me X keys. With sets, usually, the price is cheaper.
I also wondered if there was a better time to another to get the keys. Is it be possible to obtain special? If so, is there a time of year in particular, or should I check the store frequently?