Not sure where you are. But I just compared Crucial DDR5 32GB DDR5-4800 (PC5-38400) and the non-ECC (on CDW.com) is $186.99 for part (CT32G48C40U5) and $229.99

Not sure where you are. But I just compared Crucial DDR5 32GB DDR5-4800 (PC5-38400) and the non-ECC (on CDW.com) is $186.99 for part (CT32G48C40U5) and $229.99 for part (MTC20C2085S1EC48BA1R) a 22% premium. All Alder Lake chips (the ones shipping in volume today) support ECC, check ark.intel.com to be sure. For example the popular i7 model (https://ark.intel.com/content/www/us/en/ark/products/134591/intel-core-i712700-processor-25m-cache-up-to-4-90-ghz.html https://ark.intel.com/content/www/us/en/ark/products/134591/...) As do all Ryzen desktop chips (5000 and 7000) do as well. Granted popular consumer products don't have ECC, but it's pretty straight forward to built it yourself. Just make sure the motherboard you buy (Intel or AMD) supports ECC.