Last time I checked, the small props ran about $5.00 each and it was one of the vendors in the Subcommittee list. There is not a lot of difference in the motors, they use a permanent magnet. One thing that was useful was to take one motor as a sacrificial motor and use the center pin to remove the weight from the pager motor. The weight is just pressed on (you can see the little dimple). Take a piece of metal, cut a slot in it to fit betewwn the weight and the motor, bang on the shaft and you're done! Don't try to pry the weight off.
Just one more wire!