National car rentals do exist, although they'r not very popular.

They are very popular with me. As far as I can see, they will always have my business. In the US, it is common for car rental companies to not rent to under 25 year-olds period. Because National will rent to me now, they have my customer loyalty. I am even an Emerald Club member for them.
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-Rob Riccardelli
80GB 16MB MK2 090000736