At Salute a few years back I picked up some nice vacuum formed scenery. I have long ago lost the company name, but it
was something like 'Amega'. They do some very nice desert stuff, such as:-
Adobe buildings; Roman/ Greek temple/theatre base (great for long forgotten ruins) and sand dunes.
All of the stuff is light, therefore easy to transport to club etc. The sand dunes even stack, as there are only a few designs
per vac-formed sheet. That does not matter as, once cut out from the sheet, you simply place them with each having its
own facing (e.g. shape 'A' put one facing North, one Southwest etc.) Dunes are also not scale specific. The models are about
25mm tall. A small mound in 28mm is a small hillock in 15mm, but a big problem in 6mm.