Here in Canada, there are two stores that sell the original grids right off their shelves. Wal-Mart, and Zellers both sell the brand name Rubber Maid. I realize that not all WAl-Mart stores, and not all Zellers stores sell them right off the shelves, you'll have to check your local stores.
Wal-Mart sells the original 9x9 grids for $22 (canadian). There are 12 grids, plus connectors in one package. Your color choices are limited to either white, o grey. They are in the same aisle as the dish racks.
Zellers also sells the original grids for $19 (canadian), for the one package. Your color choices are limited to just white. They are on the same aisle as the closet organizers.
I've never bought my grids on line, but it sounds like you get a better color selection. But I do like buying them from the store shelves, because it's pretty handy to just run to the store, and pick them up.
Anyway, I hope your local stores offer you the conveinence of buying from their shelves. If you do have a local Wal-Mart, or Zellers store that keeps their shelves stocked with original grids, would you please post it here, so that others who are near by can puchase from there as well?
My local Zellers, and Wal-Mart are in Alberta, Canada.