I'm back to building the PSPi Zero boards after taking a small break for Christmas, and I'll have them stocked again shortly. Backorders are open temporarily if you want to order one now. It takes a week or two for me to build and test a batch, so they will start shipping early to mid January.
https://othermod.com/product/pspi-zero/

I had to increase the cost of the board a bit because my part costs skyrocketed. Many of my parts (such as the ATmega328p) are out of stock for up to a year, and I have to order from resellers at increased price. Also, many of my board shipments went missing over the last month. I refunded the buyers for the lost packages, but if it keeps up I'll have to switch to a service with insurance. In the past, I've shipped hundreds of packages with only one or two going missing, but everything is a mess right now.