Buy 1 get one half price

Hey all,

I have been trying to find this but no luck and need it urgently.

I am trying to get it so that you can run the offer "buy 1 get the 2nd half price" and so on. It needs to apply to certain products only and also work if the customer puts in 4 items for example.

Any help would be much appreciated

I think this just saved my life - http://forum.opencart.com/viewtopic.php ... 34#p208576