Discount - 3 for £2

I have just installed Zen-Cart and I am adding items priced £0.70 each with an offer for if you buy any 3 from the category it is £2. Anybody know how to do this???

There's this:

http://www.zen-cart.com/downloads.php?do=file&id=135

You'll have to test it to see if it works with the current Zencart version.

Quantity Discounts does work with the current Zen Cart version but it doesn't do 3 for L2.

So do you know if there is a way to do this?

More information:

I have a category "Tumblestones -> Medium" and if a customer buys a multiple of 3 of any of the items from there (eg. 1 amethyst, 2 hematite) then the 3 items become £2. If somebody buys 4 items it will come to £2.70 because its only the multiple of 3's that get the discount

Anybody got some help?

I am unaware of a solution like this. In general, pricing modifications to Zen Cart provide discounts; they don't change the base price of the item.

Furthermore - quite frankly - your idea is not compelling. Offering 0.10 off when people buy three items is unlikely to change your sales picture. "Buy 2, get 1 free" will attact people's attention. "Buy 3, save 0.10" - not so much.