The stakes are not easy to find, I went to Tucson last year just knowing I would be able to pick up one or two and I didn't see any! otto frei has them on their site but they always seem to be out of stock, I heard that Allcraft in New York has them, but their site is...well, google it and you'll see it - it's lacking. I ended up buying one from a company in Colorado and I just can't think of the name right now - go search the Orchid archives (ganoksin.com), I found the Colorado company from an Orchid post. If you're up to it, you can make a stake from nylon or delrin - get Metal Technics ( relatively cheap book), there is a template than you can use to make your own stake. Plus, the book is fantastic if you really like working with metal.
oh, you need a hammer to use with the stake - plastic, nylon or delrin that is wedge (not sure that's the right name) shaped. I bought mine from the same place I bought my stake. Hope that helps.