How to reliably buy 4K’s with slip covers?

I’m an avid movie collector, and like a lot of people here, I care a lot about the box art and the physical presentation of a movie in my collection. Steelbooks have been super popular over the last few years, but I personally prefer to get my movies with the slipcase.

Now that there’s so few places to buy 4K’s in person, I’m finding it more, and more difficult to get movies with the slip covers. I recently ordered 6 movies from Amazon, and only 1 of them came with the slip cover, despite all of the listings have the slipcover in the photo.

With all that being said, do any of you have tips, or recommendations on how to buy movies with the slipcover? Is there a rule of thumb to follow for when to anticipate a slip cover has been discontinued? Would love to get some opinions on this (albeit trivial) topic, since I’ve found it really frustrating of late.

Thanks, and happy collecting.