Two tank boat dive costs me $75. So $37.50 per dive, 5 dives that's $187.50. That's going to cover boat fees, and obviously there's some profit built into that, otherwise charters wouldn't make any money. Figure the cost per dive would be even lower because it would only be 2 days out on the boat. Book is around $40 if I'm not mistaken, and I don't know what PADI's fees are like, but I'm guessing $60-$80. I'd expect to be around $300.
Just taking a browse through non-local dive shops, even out of state, I see a lot in the mid to upper $200's, and I'm sure for some outfits $400 is worth the time of the instructor but this specific course seems pretty silly to me. Only thing I want out of it is the option to not have to hassle with dive operations about depth of dive. I'm interested in some of the specialties, like night diving, and I would certainly take a course before ever doing night diving, but one specialty night dive as a part of the AOW course isn't going to do anything for me, I'm still going to need to drop another $200+ for a night diver cert. I felt that the nitrox course was too expensive for what it was as well. All I did was answer a short test and have a dive master show me how to use an O2 analyzer, so difficult! Kind of turned off from the PADI cash cow courses.