Best cam gears

Where can I find the best cam gears for the cheapest price. These things seem to vary more than any other product, especially since it is often unclear if they're being sold as a pair or single. I would like to stay away from 3 bolt patterns. Also, how can you tell if someone is selling the old 3 bolt AEM's or the new 5 bolt AEM's, since the aren't supposed to vary in price. These are for the H23a by the way. Thanks for any help.