I recently picked up a Proxmark and a Chameleon to do some RFID hacking from Lab401.
They're both great devices and have been a lot of fun so far, I'll be getting properly to grips with these and writing some blog posts for them soon, but for now the guys at Lab401 have generously offered a discount code for jmpesp.me readers: JMPESP-READERS.
They have all sorts of cool gadgets and gizmos for hackers and pentesters, check them out!