Fresh from the journey from ShenZhen (via Thailand), these NEMA 17 motors have a rotation of 3.75 degrees and a phase resistance of 6.4 ohms. They are rated 5VDC at 0.5A, and are manufactured by the Minebea Motor Manufacturing Corp. The cost was under $10 each on eBay, with free (3 week) shipping.
Unfortunately the leads included have an incorrect connector, but I managed to carefully force one in order to test. As this places significant strain on the motor connector, it is not advisable to operate these motors long-term with the incorrect connector. Here are some photos.
I await a response from the eBay merchant as to how they will correct this problem. Stay tuned!