Robbie, I can't remember if you are in Australia or America somewhere.
If in Australia try for a secondhand mill through your local organic co-op or permaculture group.
Or gumtree.
The thing with cheap mills is they have cheap blades that blunt very quickly and may be hard to replace or have cheap bearings that will seize if not continuously used.
The other thing about cheap mills is they will make the grain /flour very hot as they do the job. This will shorten the life of the flour you make and will change its molecular structure when it comes to cooking. It's why people go for stone grinding which keeps the flour cool during processing.
If you have a meat mincer with a variety of grinding plates, the plate with the tiny holes will give you a reasonable starter kibble.
Then finishing with a hand turned stone grinding wheel. These can be found secondhand because people don't want to grind by hand anymore.
Again, hunting through the alternative community may come up trumps.
I just checked google for a grinder and saw a Kenwood attachment for the Kenwood Kitchen mixer. That would probably be a quality product if you already have the mixer of course. Otherwise maybe you can find a mixer secondhand and buy a new grinder or maybe you can strike it lucky and get a full kit secondhand! I think
Then I found this which is new so you could buy it online. Its a hand operated mill. AU$75 looks like a mincer.
https://www.gumtree.com.au/s-ad/gow...es/corona-grain-mill-hand-operated/1253803057