Years ago (2006), I found a comb binder on ebay. It was about $112. Did not include supplies, which are easy to get.
the trade name was Ibimatic, which is a brand of Ibico.
It's handy to have. I don't know if I use it enough, but unless I want to go to my copy/print place and pay them, there's no other way.
It's also handy for disassembling an existing "book" so you can copy a page, etc. Then, when reassembling, there is no equal.
You can buy covers for your "reports" but they are not the same stock, and not Tektronix blue.
It sounds like you are pretty OCD about this.
--rick chinn