It didn't look like a great cost to me. Everything about the episode seemed much smaller in scale and scope than usually. For example the anti-collaborators force consisted of all of 3 people, only 2 of which were seen in battle, for like 30 seconds. 
To me it looked like a $10-15M parting gift if I compare it to previous seasons (and if it's closer to $15M, it must be because of the Eiffel Tower sequence and fireworks show), which isn't that expensive given its length (~3 episodes). I'm glad they greenlit it, Netflix were by no means obligated, but I don't think they struggled to allocate the amount of money it cost, for one final time. It wasn't that much.
edit But maybe you don't mean "great cost" as literally as I took it

To me it looked like a $10-15M parting gift if I compare it to previous seasons (and if it's closer to $15M, it must be because of the Eiffel Tower sequence and fireworks show), which isn't that expensive given its length (~3 episodes). I'm glad they greenlit it, Netflix were by no means obligated, but I don't think they struggled to allocate the amount of money it cost, for one final time. It wasn't that much.
edit But maybe you don't mean "great cost" as literally as I took it

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