St. Etienne Airport rental car

Hi,

We're flying into St. Etienne Airport (EBU) on a Saturday around 13:30pm. I'm having the MOST difficult time trying to locate a rental car. We need to travel to Limoges and will be there for a month so the car is the best option.

All the rental counters seem to be open for just one hour and even within that window every online site won't let me book the car. Does anyone know anything about this???