Hi - Check some of the mail order catalogues or search Internet. I remember seeing ribbon re-ink systems in Global, Micor-Wearhouse, Tiger, etc. recently (right next to the inkjet refilling, which I watch for my HP560C).
There used to be many re-ink outfits that would sell a re-ink device and ink for whatever printer model. I think many/most have gone by the wayside due to laser, inkjet, etc. being more common than ribbon, but I think there are still some out there.
Way back when (10+years) when I was looking for a similar solution, I remember (vaguely) that it is important that you get compatible ink for whatever printer model you have. You can't/shouldn't just use 'ink'. While you may get reuse and such if you use any ink, overtime, having the wrong type begins to clog, plug, wear, etc. your printer and what you might have saved in ink, you will loose in repair (or early replaceent).
Depending of the quality of the ribbon, we use to re-ink 10-15 times or more as I remember. Cotton ribons didn'last as long, but the initial cost was less (don't remember is cheaper with re-ink was really cheaper). Those with a nylon (I think it was nylon, maybe silk) lasted much longer, cost more but better print quality and morere-ink). You can tell the difference by looking for 'fuzzies', cotton has lots and shows wear spots sooner and deepter. Nylon/Silk has a 'sheen' 'shine' like a silk or pollyester shirt. lo
