Jens Najewitz produces an outstanding range of Napoleonic terrain for 3D printing, which can therefore be printed in a variety of scales including 15mm or 1/100. You can see the full range here:
www.3dprintterrain.de.
If you don't have a 3D printer of your own, some of the buildings can be bought from licensed printers on eBay and elsewhere. These include WarFayre (
https://www.ebay.co.uk/str/warfayre?), as mentioned by Baron von Wreckedoften above, and Highlands 3D Prints (
https://www.ebay.co.uk/str/highlands3dprints?).
WarFayre currently appears to have more of the historic Waterloo buildings available for sale in 15mm, whereas Highlands 3D Prints offers 'French' buildings many of which can probably pass for Belgium in 1815.
I second Jemima Fawr's recommendation of Tiger Terrain, but as he says Tiger Terrain is not currently taking new orders.
Hovels buildings are nice too.
