As simonm has just pointed out to me, the Snapper Feeder is libnfc compatible (uses a PN531 NFC chip like many others)... I'd prefer a a flat reader but it's $43.95 including shipping from their online store and I wouldn't have to wait for it to get here from overseas.
We have a few Skye Tec modules at work, but no ways can I get you any. We have to jump through hoops to get any out of the US, all the export declarations and stuff. We fit it in a case to make an IP65 rated reader for a lab in AU which test milk samples. The vials have high frequency RFID tags.
We have made a reader, but it integrates with another product of ours and not really suitable for standalone (PC) use.
But Skye Tec would be a good option if you can source it.