It looks they are phasing out out. The US store didn’t have it the last time I checked, but stores in other countries had it.
Unfortunately, like within bambu studio, there is a lot of ambiguity in the description and explanation. The description is confused between ‘plate’ and ‘sheet’ or ‘side’. It is a pity that they do not have anyone on board who can write good english technical documentation. I’ve no idea how it translates into other languages.
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From what I’ve read on the WiKi, the engineering plate is used along with a special Gcode they provide to allow you to do manual tramming the bed using the three bed levelling knobs underneath the bed for X1/P1 Series printer.
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Not on the current wiki page…
I think the intent is just to use any smooth, non-textured plate. I’ve used both the Cool and the Engineering plates for tramming.
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That’s odd. I read that wiki article not more than two weeks ago and it stated that the engineering plate had to be used.
Thanks for pointing this out. 
I received a new X1C two weeks ago. It came with textured PEI plate. Been working fine with PLA and PETG.
Engineering Plate works really well with ASA/ABS. I have not tried the High Temp Smooth side yet.
Any substitute? Textured PEI seems problematic even with glue/liquid glue.
I like the micro textures of Eng Plate.
My original engineering plate was a coating. Not a sticker. It did have a cold plate sticker on the back. The engineering plate is nice. It has a very low texture. A middle ground between smooth and textured. Also, the prints dont leave imprints in the plate like the new bambu high temp stickers do. The new starry night and galaxy stickers are trash. Every print leaves a stamp in the sticker.
I have 2 different Engineering plates (sheets / sides).
One is really glossy and shiny and one is matt and slightly textured.
The shiny one came with my kickstarter X1C and the matt one came with my later X1C. Both are on the back of the Cool Plate.
On my High Temp plate I also have Engineering sides. Both of them are of the matt type.
I would love to get my hands on some glossy Engineering plates since they leave a glossy finish on the products but it seems they are no longer for sale…
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Chris,
I also received the shiny engineering plate with my X1C purchase. It’s thicker and more durable than the later matte version. It seems like the surface finish is baked into the plate on the shiny plate. The later matte engineering plates appear to have more of a sprayed on coating. When the shiny plate gets gunked up over time I use acetone to clean it without issue. I tried that once on the newer matte plate and it immediately destroyed the surface coating. I wish I could get my hands on a few more of those older plates.
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Few things are as aggressive as acetone and I’m amazed that so many use it for cleaning and occasionally ruin expensive stuff in the process. I wouldn’t even try it for anything remotely related to 3D-printing.
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Another good reason to print on glass.