It's not a consolidator but I've heard good fares are (or were) available from ATA (an airline with a hub at Chicago's Midway). They have a website ata.com but I would suggest calling their 800 # as the website is not very user friendly. They only have flights on certain days of the week. Hope this helps.
Not sure about Hawaii but my TA uses DiscountTickets in NYC....DTFARES.com.Also have checked pleasantholidays.com but the times that I checked AirOnly,it wasn't any better than anything I could get on my own.However,I have seen numerous osts here from Hawaii bound travellers who have found great fares on the pleasant site.Some friends got a real deal from MLT Vacations out of LasVegas.
HTH
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HTH
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I've used a consolidator for Europe and Africa and see would see no difference buying tickets from one for Hawaii? However, I have had great luck using them in the past. The only down-side is if you have to make a change (travel dates, etc.) after you've bought the ticket.