Depends on the currency and where you're from, but when it's written 3500$ its typically because that's how it's pronounced. Thirty five hundred dollars. It's not a hard and fast rule.
I was just trying to be helpful. The vision pro is only available in the US as far as I know, so therefore it's USD. In that case the $ goes before the number. It is a "hard and fast rule". If we're going to be technically correct. The best kind of correct :). Not trying to be a butthole. Just trying to help people with grammar or spelling? idk. I hope y'all have a great day.