OC 1.5.4 - can buy it only with other product

Hey there!

I have some products with special prices on discount and I would like to set them in the following way:
- a customer can buy the item only with other items in cart.
Why I need this you ask? The products I have are cheap ones already without the discount on them. I would like to give them cheaper but only if the buy something else too. This way I have shipping covered and I can sell the product on lower price.
Is it possible? is there a module or extension for this? I am using OC 1.5.4 on one of the shops and need it compatible for this.

Thanks in advance!

You could do this with Restrict Checkout. What you can do is set a restriction like this, so checkout is disabled if the restricted products are by themselves:

Rule: Product Group: Cart has items from "only any" members of "Restricted Group"

Feel free to take a look at the screenshots and demo site, and if you're interested let me know at www.getclearthinking.com/contact if you have any further questions.