cracked my rear carbon rim a while back and unsure if I should even replace the rim (no longer sold online only secondhand) or go another route

the rim is a Stan’s Notubes Valor ZTR laced to a SRAM hub. The front wheel is completely fine so i’d like to replace the rear rim as inexpensive as possible but i l don’t know where to go from here: buy a used matching rear wheel for almost $400 which i dont want to pay that much for a used matching rear wheel unless its the cheapest option.

what else would anyone suggest?