I bought a 1TB SSD yesterday to slap into my son's Xbox One for the princely sum of £88.98 with free next day shipping. Yes, it's SATA and not PCI-E, but some NVMe drives are available at roughly the same price as well now.
A few years back, I recall Apple charging £400 to go from 128GB to 256GB on one of their devices. When the retail price differential on 128GB was around £50 if that. That's when I realised what a rip off Apple gear was. And looks like still is.