Promo Code For Each Individual Item in the Online Store

It would be awesome to be able to run discounts for certain products in the Online Store based upon each individual item. Then, have a check box or a way to apply the specific promo code for each item that could qualify for the promo code. It would also be great to be able to set a time frame with an expiration date. That way you could run promo codes for holidays like Black Friday, all leotards are half off by using promo code HALFOFF.