I'm just gonna leave this here to provide you with more links and such.

Wow, I had no idea there are less than 4k crate #30's. Thanks for the link.

Although the links you show are trades, I don't see any with COs in your range.I see buyouts around there, but no COs around the 18 keys you suggest.

Heh, even better, ~33% of them are in f2p accounts, which will probably never be seen, so there are something like 2,485 left. This should get interesting.

Can I ask how you arrived to 46.41 exactly?

These aren't selling for 18 keys yet.