I bought several finals DVDs from past NRHA futurities from Waltenberry. They used to to the video there. They're only $50. much less than what Seehorse charges for Nationals or Scottsdale videos. finals is 25-30 horses.
http://www.waltenberry.com/products/Youtube is also a good place to watch reining runs and some interviews. if you do a search on reining or NRHA.
joining NRHA will get you the rulebook (which explains maneuvers and penalties) and a subsciption to the REINER magazine.
http://nrha.com/The NRHA futurity starts tomorrow in OKC and runs thru Dec. 1. Last year they offered a live webcast for a fee, but I didn't have a fast enough DSL for it to work. Too much stopping and delay. It was from Mustang video. I haven't noticed if anyone is offering it this year.
There's an Inside Reining show shown on RFDTV and you can find a link to the schedule at the NRHA site.
I'm also told that scribing is a great way to learn some more. I've never done it and I don't think you could do it without a basic knowledge, but something to think about for next summer. Eleanor could help you with that.