Your going to have to pay higher.
For a settlement that's advanced and actually making a reasonable amount of money you will probably have to pay upwards of 90k.
Florida isn't very advanced, at least not its capital (I'll have to check to see what towns are in the region).
If I'm going to have to save that much I might see about taking St. Augustine by force and buying the French territories...
V&V RIP Helmut Becker, Duke of Bavaria.
Come to the Throne Room for hotseats and TW rpgs!
Kermit's made a TWS2 guide? Oh, the other frog....
Its easier just to find out which regions that faction really wants (I think every nation has certain regions they covet more), take that region, then trade them for the region you wanted.
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