You'll need 3 servos for cyclic and 1 for the tail. How about batteries? You can use 2 3 cell lipos wired in series or you can run individual 5 or 6 cell packs. I personally haven't bought anything used off of Ebay. I've heard people talking about Zippy lipos. Haven't heard anything bad about them and they're quite a bit cheaper than the big name brands. I don't know where to get them but I'm sure someone will let you know. Alan