People generally only need one, or two, while they fab or prototype their own board. You could also use assort H7 NUCLEO/DISCO boards as a proxy.
The STM32H753I-EVAL(2) is probably due for a refresh using more current parts and a DSI screen.
Also now they have Dual Core and DSI working the H757 probably would be the preferred target-de-jour if you need an H7 with crypto. The H750 also supports in a single core.