The link you provided is to an October 2008 (not a 2009) guide and for the life of me I can't see a rule 5.9.3 that deals with the topic at hand. Can you steer me closer to the right direction?? I fully admit I could be missing it!

I tried to use a credit card to purchase my Toyota in 2008 & the dealer would not let me, referring me to a sign posted at the front desk that limited credit card transactions relative to purchases to $3000. I was annoyed & called Visa, where the rep claimed that merchants cannot limit the lower end of the transaction (which we all know they try to do) but they are entitled to limit the upper end. I didn't pursue it any further, but now that I have heard that others have been successful I might take a different approach. My Mom is at the beginning stages of a car purchase.