RadioShack Corp. is preparing to shut down the retail chain in a bankruptcy deal that would see half the stores taken over by Sprint Corp. The rest of the stores would be shut down. Sprint and RadioShack have been in talks about co-branding the stores. Another bidder could emerge to acquire RadioShack and continue operating the company. Standard General, a hedge fund and the largest investor in RadioShack, was also in talk to serve as the lead bidder at a bankruptcy auction.