Well, maybe we can now take this opportunity to put together a list of online stores team's have been using to buy gears and sprockets, or whatever is on the additional hardware list.
I know most people know about this place already, as especially the engineers, but I will post this anyway.
http://www.mcmaster.com/
They almost have everything you will ever need for hardwares. And you can tell them to ship them to you overnight. And they seems to never run out of stocks.
Since FIRST allow us to buy any amount of sprockets/gears at any place, we should really take advantage of that, especially a lot of teams are just take the easy way out and get from small parts.