Cheap for a PCI-E x16 Gen 5 and M.2 slot. Most motherboards up to the $400 price point sacrifice one or the other with a gen4 slot.
NZXT - BIOS and board are supplied by Asrock, so if your worried about the CPU burning up maybe don't get one. (don't think any NZXT reports of CPUs being burnt)
Local price is about $450-$500
What about B850 motherboards?