Anton, you are simply the greatest.
I was about to go back and do another mod that is similar but doesnt add to the pricing tables.
For reference that mod is located here
http://forum.x-cart.com/viewtopic.php?t=1696
The only question I still have about this mod is what happens when someone accidentally has the same sku for 2 products? Wouldn't that pooch the whole thing?
I prefer to update off of Product ID if possible.