Rif Raf Miniatures have added terrain pieces to their online store.
From their announcement:
Rif Raf Miniatures now stock 15mm and 28mm buildings and terrain from Area9 and NP Models respectively. These can be used for a variety of periods, ranging from historical to sci-fi.
Our website is being continually updated with new stock – this will eventually show all other ranges and items we take to trade shows as well.