The TRF7970A NFC booster back (made by DLP Design) is now available direct from TI. It's also available as a bundle with a G2 or F5529 Launchpad but costs the same as buying these seperately.
Perfect timing for me in the UK as I was going to be stung with £12 ($20) shipping or have to order 3 at once from Digikey or Mouser. TI's free shipping makes such a difference sometimes.
I asked DLP whether they thought it'd be able to read implanted glass tags like my xNT and they said probably not. I think it will if really close. I guess I'll find out.