If you're going to pay using Visa, there's a Visa code and coupon
here.
Mousesavers also has some codes and coupons. Most are good through mid-June.
I have found the best rate just signing in to my Insiders account, and then using the double upgrade coupon. $221 for 15 days for a Standard. Since
Alamo doesn't have a standard aisle at MCO, I'll get a full size for that rate.
Use the kiosks to check in and you avoid the hard sell at the counter. Check in at the kiosk, go to the garage and select your vehicle from the appropriate row, and the only time you'll have to talk to a human is when you're at the exit booth.