I agree with Paul (hi Paul!) that the best way to learn Saotome sensei's weapons stuff, just like in the rest of aikido, is to find someone qualified in teaching it and learn from them. His videos are good for people who have some foundation in the kumitachi, kumijo, or nito systems that Saotome sensei does but probably wouldn't be very useful to those who haven't.
As far as getting a shoto, you could just take a normal sized bokuto and cut it down. I'm sure you can find someone at the dojo who has a "bad" (ie cracked or splintering) bokuto and make it shorter. The tip can be either pointy or not; it doesn't really matter in doing the nito stuff as far as I can tell...
Hope that helps,