Philadelphia sports retailers are seeing a surge in demand as fans race to buy newly released Philadelphia 76ers gear featuring LeBron James, with vintage sports apparel company Mitchell & Ness reporting brisk sales of merchandise celebrating one of the biggest free agency moves in franchise history. David Dee, marketing manager at Mitchell & Ness, appeared on PHL17's morning show Thursday to walk through the company's newly available 76ers merchandise line featuring James, as well as additional products expected to roll out in the coming weeks. The move marks James' fourth NBA team, following stints with the Cleveland Cavaliers, Miami Heat and Lakers, as he pursues what would be a fifth championship before retirement. A Growing Line of MerchandiseSince James' arrival became official, both Mitchell & Ness and the official Philadelphia 76ers team store have continued expanding their available product lines featuring the star forward. Mitchell & Ness in particular has continued rolling out new designs, including a black "Witness" T-shirt and hoodie referencing James' longtime personal branding, along with additional shirts featuring caricature-style artwork and locker room-themed designs.