/snip/
They are always sold out everywhere
I understand what you mean, but I think some are still available to order (or pre-order).
SyncroB.it - Availability: Pre-Order
Bobcat Miner - Shipping estimates for orders paid before 12 pm PDT on 5/1 will be 8-12 weeks.
RAK Hotspot Miner v2 - Order RAK Hotspot Miner v2 now for shipments starting Summer 2021
By the time everyone gets their hotspot all the profit will more than likely be gone, unless you can find a magical goldilocks location. Also the 5G network is right around the corner but the buy in for those hotspots are $1,000-5,000usd.