There are obviously small differences in devices and batteries, but I guess in theory your code for Krux wallet could work perfectly fine even on Jade hardware wallet, and it is currently a bit cheaper than M5StickV.
Yes, I see what you mean! That would be a cool thing to test. If it works, that could be a good source of ~$40 devices if there ends up being limited availability of the M5StickV. It would also be a good way to continue supporting Blockstream's efforts
That said, there are quite a few distributors of the M5StickV that I thought I would list here. You don't have to buy it directly from the M5Stack shop. The average price across all of them is also around $40:
https://www.adafruit.com/product/4321
https://www.mouser.com/ProductDetail/Adafruit/4321
https://www.digikey.com/en/products/detail/m5stack-technology-co-ltd/K027/10492135
https://leeselectronic.com/en/product/169940-m5stick-ai-camera-kendryte-k210-risc-v-core-no-wifi.html
https://www.cytron.io/c-development-tools/c-fpga/p-m5stickv-k210-ai-camera-without-wifi
https://shop.pimoroni.com/products/m5stick-v-k210-ai-camera-without-wifi
https://www.okdo.com/p/m5stickv-k210-ai-camera-without-wifi/