1. A medium or place where merchandise is sold in a friendly, familiar environment.
2. Selling merchandise directly in front of your home; a yard sale, i.e. a store on the curb.
3. The storefront window where the best items are displayed; a marketing strategy.
"Check it out, they set up a curbature for pick-up trucks."
The store displayed its on-sale products right at the curbature, where everyone walking by will see it!