Product Sale prices

Hi,

I am configuring Product Cart (Ver 3.12) and the setup of selling my products is a little different then how others may sell.  My products are grouped such as a 1 item, 4 item (case lot), 6 item (case lot).  After doing some tests with the quantity discounts, I realized that it ends up being very complicated for the customer and does not work properly.

I then moved to the option settings within the product page.  I created 3 list menu options for the above, a 1 unit price, 4 unit case price, and a 6 unit case price.  This works great although I do not think it was meant to be used like this. I realized that occasioanly I may have a sale on the product.  The online and list price fields in the product details would work perfectly if I was using 1 price but I cannot use it in this case since I have the 3 price options created above. 

How would I do a sale in this scenario?  Is there a way to have a sale on the product page without using a discount code that a customer needs to enter?  The sale price would just be a fixed percentage discount that would apply to any of the 3 options I created above.  I like the idea of the how the List price and Online price show a result on the savings in red.