you may also try this extension: http://amasty.com/special-promotions.html. Due to its flexible rules you can create various kinds of deals.
It also allows to create the promotions your are looking for: ‘Get each 5th product for free (or with discount)’, ‘Buy 3 products from a certain category and get one of them with 40%/50% discount (or for free)’ etc.
The module offers:
- Deals with cheapest and most expensive items
- Discount items to a fixed price and by percent
- Deals with quantity steps, of âBuy X Get Yâ type
- Create popular specials with free products
You are welcome to ask for any details and visit our Special Promotions extension page to see live demo and a user guide.