They sell a lot of the Final Fantasy action figures on Amazon- so you could check them out for prices. I just was looking at a Cindy Aurum(she is the head mechanic at the Hammerhead garage) action figure on Amazon and they wanted around 100 dollars for one. You can watch the video below for the review of the Cindy action figure.
In our region, we don't have the store where they keep the action fiture and the dolls of games. I think I'd have to import them from the aliexpress. And that may turn out to be more or less costly. And that may not be a good investment of time and money either.
As much as it looks good to have some of these action figure dolls of Final Fantasy, I haven't really seen one here. I think that the one which I saw recently was that of Ben10, and it really looked good. Maybe I would have look harder for places that might have these Final Fantasy dolls.