Julylady - were you actually able to do BOTH prepay and online check-in? The small print states that prepay cannot be used with online check-in. When I called to ask about this, the rep said that I would have to do counter if I prepaid, so I skipped that choice and reserved with online check-in only. Please let me know what you did for your rental - I'd love to skip the line and save even more money!