Anyone have suggestions for doing any better than the "Save Up To $25 on a Weekly Rental + Insiders 10% Discount" coupon code (AD2845VAN) on the Alamo website for a 1 month rental in PHL? (11/11/2013-12/10/2013)

I keep getting $568 all-in, which seems pretty good for a month, but I'm wondering if I can double-dip somehow. I tried using the HHonors code but got the exact same price and couldn't figure out how to use both HHonors and the Alamo Insider discount.

thanks for any pointers (doesn't have to be Alamo, and I don't really care what size car I get)

-huge

[edit: Never mind that price - I've now found a deal on Avis for a Compact ("Ford Focus or similar") for $406 all-in for the month. I can't really imagine I'm going to do much better than that, but if anyone has ideas of how I might be wrong, fire away...