France Car has a selection of locations with the Loire serviced via its larger cities and airports. Quick search facility and booking online.
Argus Car Rental
Launched in 1996, this website compares car hire prices from up to 450 car hire companies for 11,000 locations in 134 countries worldwide. Rentals throughout France can be booked online on the English language version of the site.
Chinon Cabrio Tours
Based just outside Chinon, this company offers a selection of classic cabriolet sport cars for hire and use in the Loire/Centre region, with or without holiday accommodation. Discount available for early booking. English, Dutch and French spoken.