A cheap “Ken onion” option is the harbor freight 1” belt sander.. $49
You can get belts anywhere from 40 grit to 1000 grit at empire abrasives pretty cheap…
Amazing deals on this 1In X 30In Belt Sander at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
I prefer a paper wheel and polishing compound to put a scalpel edge on a blade.. but a 800 grit ceramic belt will do the same job pretty quickly and doesn’t risk removing a lot of material…
If I use the belt method, I just finish up with a leather strop block and a few strokes over jewelers compound … and get a wickedly sharp edge
If you don’t trust your eye to get the angles right or don’t have a steady hand.. you can get a sharpening jig to use in conjunction with a belt grinder/sander… a decent one is $25…
For less than $100 all in to buy the jig, belts, and sander… you can reliably put razor edges on hundreds upon hundreds of knives..