It's worth pointing out that some of the sales listed on Amazon are still incorrect and the correct prices are on the marvel comics app.

For example, Amazon is showing me the Hellions omnibus edition as $20.89 USD, and the link in OP mentions that it doesn't seem like a good deal. Well as it turns out, on my Marvel app, the sale price shown is $8.99! That's a pretty significant difference. In fact, no item on this sale is more than $8.99 according to the Marvel app. So if your comixology and marvel accounts are connected or if you'd rather just buy through Marvel, I would highly suggest that.