It is actually available for prices where you can select a "from" - "to". Selling products with different size (a box for exemple) where clients could need a product UNDER a certain size but are not limited to ONE size. I am selling SAFES for exemple, sales can be limited to a certain width, height, lenght or even weight. One client could have limitation for its weights and is willing to buy one not from a specific size but UNDER a certain weight.

This is actually available in pretty much ALL filter plugins downloadable online.