I ended up being the PO guy in my department for a F500 company. We could usually buy most things around a few hundred bucks on a corporate credit card with minimal process, but certain categories and anything more expensive needed a requisition and PO. It mostly wasn't too painful as long as we had bought from the company before, but good luck getting a new supplier set up. It's quite fun to spend a month trying to get a new supplier set up only to hear that they won't accept our POs because we apparently have a history of not paying on time, despite our tens of billions of revenues.

I'm not sure whether to be impressed or disturbed at a place with no difference between a $99 and $250k order. At that place, my direct manager could authorize up to $10k, and the next layer up needed to sign off for anything above that up to I think $50k or so.