Where to find ice melter / rock salt

[photogeek]

I'm trying to pick up some more rock salt for my elderly landlord and all the stores seem to be out of stock.  Has anyone had any luck finding some around the 30th Ave. area in the past week or know of any out of the way stores that might sell it?

[aldo]

R&R General Supply at 18th and Astoria Blvd had some Monday