National - Need car rental at Miami for 12 days

I am an Emerald Executive with National and I wanted a cheap quote with National car rental from 10/18 till 10/30 from Miami airport. I am getting $557.00 incl all charges with car seat. Is there any way, I can get further down on the price? As an emerald executive member, is there any other concessions like free car seat that national can give me for free/discounted date.

I also registered for the one two free promotion, is there a way to break this whole rental of 12 days into 2 rentals like 6 days each. So that I can get a free day.

What time are you picking up? I am also an executive and did a test reservation using Id number 6600422 and coupon # ND1276FDT at Miami Intl Airport from 10/18-10/30 at 12:00 p.m. I got $420.08 all in for a full-size and $500.51 all in for a minivan. This does not include prepaid fuel, but includes the car seat. Renting two separate rentals is much higher and might not be worth it.

Thanks a lot for both the ID and coupon. Now I got $420.18!!
But the 6600422 requires coupon to be presented. Eventhough I've registered for airtran ff, I can't find the coupon, pls advise.

The coupon is from the National Website that expires on 12/31/09. The Airtran FF card can be printed off the website, but I have never been asked for it.

Consider bringing your own carseat. Most airlines let you check it for free.