Pager motor technology has made it easier for us to find a suitable replacement for the original TPM for substantially less!

Want to build something itty bitty? Try these: Just 4mm (0.158") diameter and an overall length of 19mm (0.74") with an output shaft diameter of 0.66mm (0.026").

Performance at 1.5V is 12.4mA unloaded (36.8mA stall) at 10,100RPM.
At 3V, current is 17.6mA free (73mA stall) at 20300RPM!
And just for fun, 5V give 20.3mA free (117mA stall) at 32,500RPM!