Apparently if you make a reservation on the alamo.com site right now and add 30 minutes to your reservation you can get very low rates. You don't have to use a code.

For example 3 day reservation for a prius is $314

but if you change your times to 3 days and 30 minutes it drops down to $61 !

Does any one know if this is legit?

also, if you book this, and then return it early by a couple of hours do you think they would change the total to the original rate?

Is there any reason to find out the answer to this question before you actually went through with the rental? I'm not sure if I called they would give a straight answer.