you might want to check hertz....but they are off terminal...you have to take a shuttle to get there.....
they seem to have midsize right now for 139.99 from one web site i was at...
however, if you use coupons and/or the triple A discount code you may end up with a higher price.....they seem to have different prices depending on what you use to get discounts....not just a base rate which you then use coupons or codes to get discounts with...at least this has been my experience...
you really have to play "around" a lot at their web site to get a good deal
the code they were using for the 140$ was WEBW