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Stuff like lamps and furniture, garbage cans. Surely there are scale models of these somewhere?

Try a model railroad specialist store.

While you are there, you can get cheaper flocking and scatters, glue and other bits.

Hobby shops that sell model train accessories are great. Near my house is a store that specializes in doll houses. Just be careful, as the scale will in many cases be different. I've found some great bits there, like sheets of fake wood flooring.

http://www.copplestonecastings.co.uk/

They have some stuff, not a huge range but its handy

Guess, you mean for SciFi:

http://www.antenocitisworkshop.com/sci-fi.html
http://armorcast.com/store/index.php?cPath=120
http://www.jrminiatures.net/28mmsciencefiction.aspx
Ainsty, when the new owner build up a webstore.
Ground Zero Games when they start casting resin again.

More tonight when I am back home and you did specify the setting (or other details).