Victorio has been rebranded as VKP Brands and in the pic below, on the left is discontinued and on right is identical under new VKP name.($80)
https://www.amazon.com/Operated-Adjustable-Grain-Grains-VKP1012/dp/B0018P54TS/
Self-aligning stainless steel grinding burrs for long life and smooth even milling.
I have no idea how good or bad of a job a grain mill will do for egg shells though. Seems like it should work fine as long as they're nice and dry as not to clog up the unit.
This was the “cheapy unit.
https://www.ebay.com/itm/354744334053?
Available from several sellers, and Amazon too for a bit more. $25, IIRC, if I want to risk an ebay seller in Vietnam with “0” feedback. (NO!)
If someone has more money there is also Wonder Mill, which in addition to grinding grains apparently can make nut butters! (Yum!) I have no experience on this, I am just basing this on their website. (If anyone has one of these please share your experience!)
This is the Hand mill. Its something like $349.
They also have motorized Wonder Mill version. Somewhere there was a demo where they ran 1000 lbs of grain through it in one day without burning it out. ($279 and $349 base prices) There are accessories of course for more. (Including bean grinding and flaking mill attachments.)
If we did a lot with bread and grains and had a choice I would go motorized and schedule my milling sessions during the "Future World three hours a day Carbon Free Electricity On" period that will be generously alloted by our Engineering Challenged Green-Soc Democrat Overlords. (Or have a generator or solar panels that I could run any time I needed electricity.)
My thought is that if the motorized version and ability to mill large amounts of flower might be a good small Co-opperative investment. (Church food pantry or neighborhood or Small Town Grocery store!)