Canadian Piercing Studio Tribal Expression provided us with some insights on subdermal RFID placements in practice.

The studio offers RFID placements for people who want to have keyless entry into their home. Tribal Expression uses a glass ampoule that houses a 64-bit RFID chip. 64-bit gives 100 billion unique keys. Tribal Expressions Owner Keith Kennedy likes to compare this to the fact that average lock sets only have 300 unique keys, which would mean that in a city with 1 million, 3,333 people would have the key to your front door.

VeriChip was the first to come up with a subdermal RFID chip back in 2003. VeriChip expanded their subdermal RFID solutions quite a bit since then.

Tribal Expression places the RFID unit for instance under the skin on the wrist (see photo below).
The studio charges $275 CND (~$235) for the placement. The RFID reader sells for about $400 CND ($340). Besides home access the company works on car and computer access systems for their RFID chips.
Tribal Expression 'enhanced' three people so far with RFID chips. Visit their homepage for more details and contact information, if you want to be next.