Other Car Rental Programs/Partners (ie. Alamo, Enterprise, Sixt) - what is a good rate...

My family of 6 is headed to WDW at the end of Sept. I will not be getting a car at the airport as our Disney transportation is FREE and they handle our bags. I will be renting a minivan at the WDW Car Care Center (I hope there is less of a line). The lowest rate I could find is 239.99 -11.90 discount-not sure what this is from + fees for a total of 259.72. This would be with our Costco code. Is this a good rate, should I grab it or wait for something lower. I also have an Entertainment book coupon for $15 off minimum 3 day rental, will Alamo honor this coupon with our Costco code? I can't help but feeling like I could do better than $34/day plus fees. What do you all think.
Shawna

Book it, and then shop around. If you find something cheaper between now and Sept., book the new rate, and then cancel.

You cannot use the Entertainment coupon with Costco codes... I've tried :)

Bob

Thanks Bob, that is exactly what I did. I booked it and will keep my eyes out.
Shawna