It seems pretty easy to order just the Pi? I opened the US suppliers, and of the ones that aren't already out of stock, you can:

buy directly from Makerbright: https://makerbright.com/raspberry-pi-zero-2-w-.html

or place an order, which will ship in early November, from:

* Sparkfun https://www.sparkfun.com/products/18713

* PiShop https://www.pishop.us/product/raspberry-pi-zero-w-2/

* CanaKit https://www.canakit.com/raspberry-pi-zero-2-w.html