I generally see prices that are higher. I'm surprised to see that you found a deal.
im wondering if i am trying to book too far in advance? I went on orbitz to see the price difference heres what i found:
Nine months is an awful long time in advance for a car rental. When I'm planning that far out, what I do is make a reservation (or more than one, with different companies). Then, I check the rates periodically. If they go down, I book at the new rate, and cancel the higher one. (There are websites that do this for you, like autoslash. I've never used one.) Nine months out, I'd check once a month or so, then weekly as it gets closer. Also, the seasonal special rates/sales arent published until a month or two out, so keep an eye out for them. Prepaying for rentals rarely works out well.
Also, if you want a convertabile, book one. Don't rely on Chase's description of what the fleet is (they're wrong!). Every rental agency considers convertibles a speciality class, and the only way you'll get one is if you book one, or pay to upgrade at the counter.