Just start buying them one at a time. I have about twenty pairs and never bought more than two at once, they are expensive.
I use only "ViceGrip" the original. There are pleny of off brands that work well, those at Sears may be Craftsmen or ViceGrip, I don't know what you are looking at.
What project are you doing that you would need a bunch of ViceGrips at once?