I did PDL-LIS about two weeks ago, booked in Y but got tons of emails offering to bid up (I think they were daily starting about a week before the flight). I wasn't interested on such a short flight so didn't pay much attention to the price but I seem to recall the minimum bid was wayyyy lower than what is being discussed here for intra-Europe bids.
Although maybe PDL and other Azores locations are different b/c they are technically domestic, even though it is a 2+ hour flight?