Limit Products by Tag in cart

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Hello, Is there a way or an app to limit the type of products added to the cart? 

I need to limit in-stock item and pre-order items to be added to the same cart; meaning that a costumer can add only pre-order or in-stock items to the cart. My pre-order items are always tagged with "pre-order" so the code and/or app should be able to read the product tags. 

Any help would be highly appreciated! 


Mylene :)