P&D might have a couple bags of Winchester unprimed brass left. Bullets are easy enough to be had since they're .401" just like the .40S&W. Large pistol primers are easy enough to be had right now. I could even be convinced to part with my spare set of dies if the price is right.
Don't waste your money on factory ammo. Last time I saw it (okay, the last time I actively went looking to price check) it was about $50/box for Federal AE. You're likely to get marginally better performance over .40Short&Weak in a factory offering. But by all means, if you find factory ammo that you're willing to buy; then buy it all. Shoot it, save as much of the brass as you can, then sell the brass to me to recoup some of your costs.