How can I get a coupon for “first item free”

Question

It's hard to believe that this hasn't been done before, but I can't find any information or documentation on how to accomplish this.

If there are multiple items in the cart that share an attribute, I want to have a coupon code that will make only one item in that collection free. (preferably lowest cost item, but i'll settle for just "first" in whatever order)

Ex. (custom attribute is color)

• Item 1 color=red $5.99
• Item 2 color=blue $6.99
• Item 3 color=blue $7.99
• Item 4 color=green $8.99
• Item 5 color=blue $9.99

SubTotal = $39.95

Coupon would be to the effect of "first blue item free", and after applying, it would look like the following

• Item 1 color=red $5.99
• Item 2 color=blue $0.00
• Item 3 color=blue $7.99
• Item 4 color=green $8.99
• Item 5 color=blue $9.99

Is anyone aware of an extension that covers this?

Answer 1

Off the top of my head, none of the extensions I have used do this, but some quick searching yielded this result: http://store.fooman.co.nz/magento-extension-advanced-promotions.html

It looks like it will do what you want, but I would ask the developer first (as always) to make sure.