Doing our Logrono to Bilbao one-way car rental with Enterprise but via Costco Travel gives us the second driver (spouse) free and a slightly lower rate on the base rental. However, if you book this way on Costco you are not locking in the price for one-way rental dropoff or CDW, and I don't see a line-item for 21% VAT either. Has anyone had problems with those fees being really inflated if done later at the checkout counter?
If you instead reserve directly with Enterprise those fees are already set, but you lose out on the 2nd driver free and the price advantage above. On other sites I do see warnings that CDW cost at the counter may be artificially higher if you don't guarantee the rate at the time of booking from the U.S. Thanks in advance for any feedback. I'll monitor replies even if I don't post again.