I recommend this one:
http://www.leevalley.com/en/garden/p...33,44734,66386
I've seen them at other places, like London Drugs, but they're at least twice the price. Get a couple of extra trays too. Six seems perfect when making jerky. I rotate them every hour or so to make sure it dries evenly.
Alton Brown's recipe is pretty much standard, so I would give it a try.