So 48P-KDLX is back again in the shop after a while sold out.
The board price (pcb only) did slightly increase due to production cost (+1 EUR) and the completed version did increase due to time necessary to build this manually (+2 EUR). It is planned to let this produce with industrial assembly for future which would be in the same price region, I think.
48P-KDLX pcb only = € 13.90
48P-KDLX assembly kit = € 29.90
48P-KDLX completed/tested = € 36.90
ZX80 / ZX81 hardware and software offered for sale or swapping