We useda company called Remote Identityduring development, They have variety of RFID tags you can order (www.remoteidentity.com) from. They support 15693, 14443A and B in different form factor.
From their home page, select the catalog section which display all the RFID tags they carry. It also has all the specs for the tags. You can filter your choices byprotocol, frequency and form factor.
Some tags we used during development and testing were:
- 86x54 ICODE SLI SL2 Sticky Label
- TI 45x45 Tag-It HFI Square Sticky Label
- Philips ICODE SL2 PVC Card