Is there a way to create a shared cart experience within a single site context?

Summary:

I need to implement a shared cart feature where profiles under the same account can create a shared cart, update it and then place the order. To accomplish this we are planning to use purchase lists as a foundation to enable this feature. In summary we are planning on using the purchase list as a single source of true when a cart has a reference to a purchase list, however we are wondering if there is a better approach to this.

The feature we are planning should allow:

1 - User A adds item to Cart

2 - User A share Cart with Organization or single user (User B) of the Organization