I'm seeing a convertible for for our 9/27-10/04 week for $136/wk + taxes $185 total using 10% discount code DC3190 through Advantage.
On further checking, this is the prepaid rate (although I doubt that you will get a convertible for less since other companies are up over $500 for this time period)
Pay later (cancellable rate) is $225 taxes incl.
The other downside is that Advantage is not in the terminal at MCO, there is a shuttle that takes about 5 minutes.
I'm very tempted myself, currently have a midsize booked with
Alamo for $144, $41 more lets me put the top down. Now as long as there are no hurricanes while we are in the area, the convertible would be great for soaking up the Florida sun.