As many of you no doubt already know, this weekend was the official kickoff of the 2013 car auction season. With the biggest event being the annual Barrett-Jackson auction in Scottsdale, Arizona, there were plenty of high-dollar, well-known cars up for grabs, including more than a few valuable Mustangs. 

Yet despite a lot of anticipation and bidding, this weekend proved kind of disappointing in terms of Mustang sales, especially for two of the most visible Mustangs on the block. We are talking specifically about the 1968 Shelby GT500 EXP, and the one-of-one 2013 Shelby GT500 Cobra tribute car. Only one of these cars sold, and it was for a lot less money than hoped.

The car that sold was the GT500, which was built as a tribute to Carroll Shelby himself, who passed away last year. This tribute car brought together Shelby, Ford, and numerous friends of Shelby himself, who built a wide body GT500 with the intention of auctioning it off for charity. You’d think such a car would command a premium price, but when the gavel fell, the final bid stood at just $200,000, with the proceeds going to the Juvenile Diabetes Research Foundation.

Meanwhile, bidding for the ‘68 Shelby GT500 EXP, which is a 390-powered experimental testing car, reached a staggering $1.8 million. Yet even this sum wasn’t enough to meet the reserve price set by the seller, and this unique, one-of-a-kind classic Shelby rolled off the auction block without being sold. That’s kind of disappointing, but hey, there’s always next year…