I picked up a trio of MDF adobe style buildings from a gent called John on eBay for £9.00 including free postage.
You couldn't buy the materials to make them yourself for that!
Quickly bashed the basic buildings together - you get a 'small', 'medium' and 'large' selection, the large one coming with a side element and a walled garden.
Not added the side structure yet but glued the walled area to a separate base. So far very pleased, the buildings fit together well and are very simple to construct. All come with separate doors and roof hatches. There is clearly plenty of scope for additions and modifications but I will probably keep mine fairly simple so I can use for different periods and settings from Wild West games to Pulp Alley.
Picture below from the eBay listing by John.
Find him (JBMDF Wargames) on Facebook and eBay.