I have been using Lanscaper's Choice (
www.kissner.com) on the sidewalks this year at the animal hospital. No complaints so far. Costs me $14.40/50lb bag and I only need about half a bag to do it. Regular Sifto Salt on the parking lot.
Landscaper's Choice is Calcium Magnesium Acetate, claims to be safe for children and pets, and I can tell you from experience you can spread this with your bare hands and not feel a thing, and not end up all shrivelled up like a prune afterwards like salt.
Honestly, I've been really pleased with the stuff! Urea is over $20 per 50lb bag here. Alaskan Ice Melt is around $26 for the same amount. Sand is too messy. This has been my solution for small quantity spreading, also supposed to be easy on concrete and vegetation.