I have a current code for a minivan in may/june. I have been reading about coupon codes. But see they only good codes are with cosco. I don't I should risk booking a cosco coupon rate or membership code when I don't have a membership at all. One problem I have is no sat overnight rental. We will getting on the disney fantasy on sat. so our rental is sun-sat. I get cheaper rates but if I return them early I'm sure I will get some sort of fee? Any ideas?