Store Plugin Help?

So I’ve done searching and searching and came up with nothing. Here is what I’m looking for.

A WordPress E-Commerence Store with the ability to do the following.

I want to be able to invoice by category.

So basically, I will have a few vendors who I sell for and they will be doing the shipping. Each Category is going to have products listed by that vendor.

Let’s talk DJ Equipment

The following are my Vendors, each vendor has a category
-Pioneer
-Numark
-Dennon

So when someone goes to my site and clicks on the Pioneer Category and selects an item in that category, and also selects an item from the Dennon Category here is what I want to happen.

I want the vendor for Pioneer getting an E-Mail with the Invoice of the Pioneer Product they bought so they can ship it automatically as well as Dennon getting an Email so they can ship it out.

BUT! The Invoice Pioneer gets doesn’t have any of the other items except for the items from the Pioneer Category.

The Vendors get the Email and I would like an Email also coming to me with their invoice.