I got some Renedra plastic tents for my local gaming club (VÄS, Växjö spelförening) and have now painted them up.
I liked these tents and feel they where really worth the price. The tents are so generic that they could work from classical Greece, medieval, Napoleonic’s and work in an futuristic game.
And I guess that some of the tents could work in a different scale then 28mm as they are original intended for.
I bought the tents on Warlord games shop. http://store.warlordgames.com/plastic-tents-4247-p.asp