Conditional Quantity Discounts

[Alien]

Please excuse the newb.

I'm currently on 1.50.

How would I go about setting up price breaks like this:
1-4 of a specific item are @ the regular price
buy 5 get 6th free

It isn't a straight quantity discount where there is a price break past 5 items since if you were to buy 7 items you'd still only get one item free, the other 6 would be at the regular price. But if someone is to buy 10 they would get 2 free.

I hope that makes sense.

[ZeroGravity]

I spotted this in another thread. Check out "Another Real World Example" about two thirds the way done this page in the wiki. My guess is with some tweaking it should work.

I'm not greatly experienced with Zen Cart so if anyone can see a reason why this may not work with 1.5 please speak up.