Finally got a $25 coupon, AD2865DAD , that works for me with Alamo. Got a slight decrease with Alamo for 19-25 September using this coupon and the Disney Annual Passholder Contract ID. This coupon came with an email advertisement from Alamo.
Some good price drops with Thrifty on carrentalsavers.com for my dates next week (9/23-9/26). Full size for $114. Only a dollar cheaper than my current rental with Dollar so I'm not going to change.