What is a blu-ray slipcover you've always wanted but never found?

[Lepidopterous]

Some of us have been collecting blu-rays for 10-15 years now.

For slipcover collectors, what was the slipcover(s) that got away?

I used to have a long list of slipcovers I wanted that I never found anywhere--probably because they sold out quickly with the first release or they simply didn't produce that many in the first place. But over the years that list was whittled down to one that I never found and that one is Whiplash.