I went to order another can of Canned Heat to feed my hungry GAPs and they are out of stock due to lack of components.
I wonder if it's a brass shortage as the rest of the components should be pretty easy to come by.
If you are going to shoot GAP you should consider rolling your own. GA Arms is an attractive alternative, but for specialty calibers like gap and 10mm they often can't keep up with demand. I think this is mostly due to their reliance on other mfg for the brass.