I just bought some of the terraclips stuff specifically for dust. They arrive tomorrow. After watching the video and seeing how sturdy they stuff looks, it seemed like a good deal for lots of urban terrain. Minatures Market has it on clearance for $27 per kit. The clips are on sale for $11. How many clip sets are you using? I bought the street, sewer, and building set and 3 clip sets.

It does hurt that you can't get a lot of the heroes without buying unwanted stuff.