The RFID Experimentation Kit is the toy I always dreamed of owning. This kit includes over 12 different types of RFID tags, a USB RFID reader and a book full of fun projects. It does require a minimal amount of technical knowledge, but the kit includes every piece of hardware needed to complete basic and even advanced RFID projects. Think of it as your child's introduction to stalking. It is available for $100 and, unfortunately, is currently on backorder from Thinkgeek.