It would be awesome having the option to offer 50% off shipping costs versus only being able to offer free shipping or full shipping. This would allow sellers to offer a larger discount to buyers where they normally feel they can't afford to offer free shipping. Helps both buyer and seller meet half way. I've been hit with $20 in shipping charges offering free shipping, and that is a huge hit as a seller. I think the buyer would appreciate half off shipping verses nothing off from those sellers who just can't swing full out free shipping. I feel sellers would appreciate this option, too, making their store more attractive to those who currently only buy from sellers offering free shipping.