Since so many have been helpful I thought I should give an update.

Home Depot and Lowes didn't have any de-icer left, but a smaller hardware store had several brands. The only drawback (or so I thought) was that they were all pellets - no flake. I looked at Dow's website and decided to buy the PELADOW that the store had because it seemed to be DOWFLAKE in a different form. Anybody want to explain the difference between dihydrate and monohydrate?

My worry had been that the pellets would take longer to disolve and they did, but it was only 5 minutes. Worked like a charm for 1/3 the price of the pool stores product.