where to rent convertible going from melbourne to adelaide??

[jhg0912]

have been looking online all morning but cant find any car hire company that rents a convertible and will let us pick up in melbourne airport and drop back at adelaide airport. some do convertibles and some do one way rentals but cant find place that does both.
we're looking at a mini cooper convertible but open to suggestion.

anyone know of one that i could try?

have already tried:
autoeurope.ie
airportrentacar.com.au
atlaschoice.com
diycarhire.com.au

thanks

 

[Lauren]

Try Avis. Have rented a convertible from them before in Australia.