In response to 141179: Car Rental Prices, posted by Joe M on Sunday, 30 July 2017, at 2:47 p.m.
Short answer? Because they can. Nobody is investigating them for monopolizing the whole thing, and it's a pity. Somebody should.
Joe, I would follow Barbara's and Mark's advice: at this point your best bet might be going to discounthawaiicarrentals.com, OR playing the waiting game and hoping to win. It is a little like playing at a casino, though - you might end up losing...
I keep coming back every year to my property in Kona, and the only way for me to get relatively decent rates is to check prices on various sites every day many, many, many months ahead. If you are flying in literally in a couple of weeks, the chances are not great. So, again, I would try to go with discounthawaiicarrentals.com, take a deep breath and cut my losses there. For elsewhere, the prices are only going to grow every day. They know how to squeeze their customer dry.