If you do manage to get one, don't be surprised if it doesn't power on.
These PowerBooks are notorious for corrupting the power manager when left idle and unused as the internal (re-chargeable) backup battery goes flat.
The simple solution is to disconnect the battery, and then power up the machine and reconnect the battery and leave it to charge up (about 24 hrs).
You can find instructions on disconnecting the battery at ifixit:
http://www.ifixit.com/Guide/Installing+PowerBook+G3+Pismo+PRAM+Battery/21/1
You don't need to remove the battery or anything else other than flipping out the keyboard, so just check the last picture on page one at the above link.