I agree, Enterprise has the lowest under 25 fees, I think in FL it was $15 a day when I checked for our January trip, but we just decided to usse Disney transportation.
I had been waiting for the new discount codes to come out, all the ones I was able to find a few weeks ago expired 12/31. I also signed up for their email updates from their website in hopes they would email coupon codes, so you may want to try that.