Garth Brooks may be sort of retired, but fans in Canada are proving he's still as popular as ever.   Over 15,000 tickets to this summer's Calgary Stampede sold out in a mere 58 seconds, the fastest sellout in the Stampede’s 100-year history.    “It was ridiculous,” said Kara Coady told the Calgary Herald.   “We had probably eight computers going. I was on two, my husband was on two, and two of our friends were each on two ... It was 10:01 a.m. according to my laptop, and I couldn’t get a single seat.”    Read more here.    Fans who didn't get tickets are mainly upset with Ticketmaster, the sole ticket merchant for the concert, and online resale sites.   Prices for single tickets on StubHub, for example, ranged from $275 to $4,500 a piece, quite a mark-up over their original $62 cost.   The paper says many fans were hoping Garth would add another show in addition to the July 12th date, but in an e-mail, his publicist Nancy Seltzer told the Herald that a second show at the Calgary’s Saddledome isn’t possible.    Even though Garth does have a standing gig at the Wynn Las Vegas, he agreed to play the Alberta, Canada, show in honor of the Calgary Stampede’s centennial.