Foundry, Artizan, Perry Miniatures and others make steel pikes, spears and javelins. The only ones I've used were the Artizan pikes and I thought they were pretty good.
I usually make my own out of uncoated steel florist wire. I think 18 gauge (US) is the usual size I use. For pikes, I cut them to about 3x the height of the figure, then flatten and cut the point.
Somewhere I had an illustrated example of how to make pikes that way. I did have a directory started, but I've fallen behind on it. If I get a chance to update it (especially when I paint up some of the TAG and other figures I've recently received) then I will add the pike thing as well.
Here's the link, but as I said, it's very out of date. I've posted newer stuff here (like the stuff in the campaign newsletters) that still needs to be added.