All the usuals make decent sidewalks. VLS's Custom Dioramics, and 135th Contruction Battalion lines are places to start. Verlinden of course. A couple you may not have heard of, Armand Bayardi, and Tiger Productions. If you want to make your own there are several materials and methods. If you're making a small one you may want to consider epoxy putty. Balsa Foam is another option. Don't rule out a carved up slab of plaster either.
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