If you've got 30 developers then you've probably got, what, five or six teams? Your tech leads/senior engineers/whoever provides tech leadership at a team level are operating at a scale where they can go to the pub with your head of engineering/CTO/each other/the dude from finance who has a credit card and fit around a table.
I've worked at companies that size and the "war" involved putting time in the calendar of the head of engineering, asking how his son was, demoing the product we wanted for about two minutes and explaining the pain point it solved, then promising to get our legal team and the one security person to review it after he put the credit card in and before we used it in prod. When I worked somewhere larger it was much more difficult.
Obviously all of this is far from universal. I've worked at places that just gave me a card with $500-$1000mo limit for whatever I need. I've worked at a place when I asked for $100 of hard drive space to test something out of production they said find another way.
I've worked at companies that size and the "war" involved putting time in the calendar of the head of engineering, asking how his son was, demoing the product we wanted for about two minutes and explaining the pain point it solved, then promising to get our legal team and the one security person to review it after he put the credit card in and before we used it in prod. When I worked somewhere larger it was much more difficult.