Hey I'm looking for cheap ceramic level 4s anybody have any good recommendations?

I'm an EMT and we have been getting shot at more than usual recently. I'm looking for a good set of plates for work they have to be nij level 4 ceramic, I'm poor AF so the cheaper the better, I don't care about weight or if they are used/new I just want them to be good quality. Any recommendations, websites or deals y'all know of?