they're really easy to make, I have zero skills and I managed to make one.
the most difficult part was finding decent foam for the core, otherwise it's just 20 minute worth of cutting, glue, and patience.
I got everything from a Pearl craft store, except for the foam which I got from the trash at work. (I don't know where to buy foam, I'd try to find some being tossed somewhere since it's wasteful refuse otherwise).
I'd like to have a more creatively done one at some point with threads on the bottom so I could just mount it directly on my mic stand, but I don't know where to get any sort of a mount I could attach to it so I'm fine with my ghetto version as-is. (not like anyone notices in the dark).