It didn't sell the first or second time I listed it, so I'm now selling it starting at $9.99 + $4.90 shipping to the continental U.S. only. It's a good deal as it originally was over $40.

I bought two of them cheap and I'm selling one here. It's a 125 kHz reader that comes with 2 tags. It outputs the tag ID on a 5V TTL serial line at 2400 baud. It's perfect for projects that require contact-less identification, like an RFID-unlocked door.