I ran into a MAP violation on a bike we have on sale that is aged stock, but the supplier is sold out of it, and a new model is about to be released.

A nice workaround on cases like this for our websites would be to have an additional toggle within the sale pricing area for "hide price online". Then the item displays as on sale, but the regular price is simply struck threw, and there's messaging like "contact for price" when viewing the item along with a link to call or email.