Where's the bobblehead stand?

I know it exists, but I haven't yet unlocked it as far as I can see.

How do I unlock the bobblehead (and magazine?!) stand so I can put them in my settlement?

They are unlocked by default, you already have them.

Both are in "Furniture". The bobblehead stand is under "Misc", and the magazine racks (there are multiple types) are under "Shelves".

We have an answer that lists each workshop item, the category it is in, and the component cost of each: What is the component cost of each Workshop item in Fallout 4?.

• Magazine Rack (1 screw, 4 steel) [two variations]
• Bobblehead Stand (3 screws, 4 steel, 3 fiberglass)

In addition to building your own, when you take up residence at Vault 81 there is a bobblehead stand ready and waiting for you.