If I remember correctly every map comes with a set of stickers.
Actually, they said there would be a set of stickers included in every print box along with the map.
I'm also assuming that stickers come with additional maps, but there is no mention of them, hence my request for clarification.
From the PledgeManager extra map addon:
An additional copy of the Forbidden Lands large game map, so you can use those legacy stickers and still retain a pristine map! Double-sided, full-color, size 720 x 520 mm. Available in English or Swedish.
It is absolutely not clear that this includes extra stickers, too. It actually sounds as if the intention here is to provide an extra map solely to have one that isn't / won't be covered in stickers.
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