Looking for advice on pricing medical supplies

So, we are starting a faction selling medical supplies.we are a PVE server, if that matters. We have some O+ And O- donors that we pay. I'm curious what y'all think is fair pricing for blood, meds, bandages, etc... for what bit worth, on our server you earn cash within discord for killing imfected and for every hour your on the server you earn around 3k. You get an initial payout of 10k once you join the discord. Thanks for the suggestions.