I need to rent a car from PVD and drop at BWI for 7/3 to 7/8. Can somebody help me which is best car rental program for one way rental? Are there any website like priceline/ hotwire for Car rental. I know of autoslash but not much help. I always get error " No car for available request". Is there current better discount with airline or hotel program. I am member of almost all airline and hotel programs. So far i found costco to be better rate compared to going to respective sites but i think there may be some airline or hotel programs which will earn point/miles and plus give some discount.