Is it still possible to find the 3.1.3 SDK (w/ Xcode) for iPhone development on Leopard?

I haven't upgraded to Snow Leopard yet, but I need to interact with devices running 3.1.3. I should have grabbed that version when it was up, but I didn't.

So, does anyone have a link to the 3.1.3 iPhone SDK (w/ Xcode)?