frandallfarmer
Explorer
I heartily recommend FDG and WWG products.
I agree. There are many great paper terrain vendors over at rpgnow.com. From FDG, their Winterhawk Castle walls are awesome - easy to build and look great (search for OldSchoolDM and paper terrain on Google images and you'll see lots...)
WWG now as a pre-printed line called Terraclips. Check it out if you have cash, but don't have time to make walls...