http://www.huntingvintage.co.uk/component/virtuemart/saddle-bags
the free one is the "starter" saddlebag but any combination of the 4 will give you a free 3rd one if you input code BUY2GET3.
the problem is the free item doesnt automatically go into the cart after saving the coupon code - you have to refresh the cart to make it appear, this isnt going to work with 90% of customers. is there any way to make it auto add to the cart please?