Here is one example. Below, the less expensive base game with a single expansion is offered at $22. It has 247 backers.
In contrast, the "All-in" bundle with multiple map packs, expansions, and other goodies is offered at $90. It has 1,197 backers.
Kickstarter bundle up-sale
Another example is Fashion Nova.
Here, they create dynamic bundles based on which product is being viewed, presenting them in a simple recommendation widget.
When a customer adds an item to a cart, it is an incredibly strong signal about product affinity.
You can capitalize on this moment in various ways. One tactic is to present a pop-up with the option to continue to checkout or continue shopping.
In this pop-up, you can also offer complimentary products. Target does this beautifully with their after add to cart action sequence. Here they present items that are frequently bought together.
Above, Target presents a personalized pop-up based on the item I just added to cart. In this case, a girl's Halloween outfit.
3. Take advantage of seasonality and buying trends
Above, Amazon offers Mother's Day product recommendations above the fold.
Buying trends offer an excellent opportunity to present more relevant offers even without knowing anything about the visitor.
Amazon provides a great example.
While I am writing this update, we are two weeks away from Mother’s Day. Simulating a first time visitor, Amazon offers numerous Mother Day offers.