How many are you looking at per batch?
You'll have to order enough to make it worth the manufacturer's time and expense to tool up for a new design.
If you're looking for a batch of a brand new design and only want 100 or less ....? Isn't going to happen at a price point the consumer can afford; especially for an unknown brand/design.
When I managed a combination convenience store/game room/pizza parlor in the 1980's and 1990's, I looked into having some ink pens, and a knife with our name on them.
The smallest minimum orders I could find, Just to put our name on; black letters, no artwork, the pens had a minimum order of 250. (per color used for the name, random color for the pen body, black or blue ink refills). If we wanted pens with our name in black, red, and blue, for example, in the same order, we had to buy 250 each black, red, and blue.)
The minimum to get our name printed on the handle of the knife (on one side, not both) was 280 units.
Keep in mind this was on a knife already in production, no changes but what was printed on the handle.
In both cases, follow up orders for the same thing cost the same, and had the same minimum quantity, even though they didn't have to make the stencils for printing again.
I know Case is not interested in doing 300 to 500 of the annual Blade Forum traditional knife.
I think someone said Case has a minimum order of 1,000 to do a SFO.
In 2018 Buck made the forum knife. If memory serves, Buck had a minimum order of 300 to do that SFO, and that was on an existing pattern they had in production. (the 301 stockman. Changes from standard production was delete the spey/budding blade, long pulls on the clip point and sheepsfoot, Elk covers, CPM154 blades, and use the BF tang stamp.)
I don't know if Utica is still doing contract work, or what their minimum order is.
Be aware any special orders have to be fully paid for before they will make the first one. They don't do consignment.
You might consider contacting CRKT and licensing your design(s) to them. They work with several designers.
I may be mistaken, but I think Mr. Ken Onion got his start with them with his Ripple design. I don't know if he had any designs made before the Ripple.
(CRKT made the Ripple (with aluminum scales) before anyone else. I had the CRKT Ken Onion Ripple at least two or three years before Kershaw(?) had the Ripple in their line-up.)
Good luck in your endeavor.