They're not new PCs, they're ancient, at least if I'm looking in the same place as you. $330+ for a Celeron or P4 CPU and an old OS, no thanks.
Not sure about over there, but here if you look away from places advertising that they specialise in legacy OSes, you can pick up a refurb machine with similar specs and an OS, plus support (so, no difference to that place) for about £40-50 at most.
Those prices are just sky high, it's a nice enough idea but they're way out of line on pricing - especially when running a virtual machine with the legacy OS on a new PC would be much cheaper and potentially better.