I actually recently bought a bunch of Macchingu Machiko Sensei books off of Amazon.co.jp. I might be able to upload them someplace.
Basically the author, after the manga ended serialization, did a bunch of "fan works" of their own comic.
https://www.amazon.co.jp/gp/product/...ies_rw_dp_labf
They're mostly just silly little stories that weren't part of the main comic proper.
One thing I do want to get, but can't get digitally, are these two books:
https://www.amazon.co.jp/ま.../dp/4835455789
https://www.amazon.co.jp/ま.../dp/4835455797
Which are collections of other fan comics the artist created and sold at comic expos. I saw a few of these on WinNY way back in the day -- they're a little more lewd than the normal comic was.