UA SEA-MNL $730's AI - +Island Hopper return..
I'm seeing on exploretrip.com Oct16-28th for that price with the Island hopper on the return. It doesn't tell you that it's the Island hopper, but looking at the flight number/schedule you can see that it is. (Flight 172).
Supposedly this is a published fare that I can see on ITA, but not sure how to book it.