Anytime someone is insisting on using their own odd ball freight company and wants you to contact and pay the shipping company direct, it is a scam. I like to ask them for a credit card number, never run it of course and then tell them the number is bad can I get another one and then just keep doing that until they go away. Also tell them they qualify for free shipping and then just laugh at how they insist on using their freight company and won't let you ship for free. Sad so many people feel the need to fleece small businesses.