Good morning,
We are developing an online store with Virtuemart 2.0.14 and we need that if you buy more than 5 products you get one more free. We tested with the plugin RELATED QUANTITY PRICE CALCULATION but only got it done in a single product, not the total. Could you help us or give us some idea. Thank you very much in advance.
This company http://awodev.com/have made an advanced coupon plugin that might help you, I haven't used it yet still deliberating whether to buy it, but they did answer my email when I asked them question about if their plugin was suitable.