It looks like the closest thing we have to a RadioShack buyer is private-equity firm Blackstone Group, in a deal that could reach $3 billion, the New York Post reports. The article says that CEO Julian Day wants to accelerate the selling process and is making presentations to bidders this week, which could also include Kohlberg Kravis Roberts & Co., Bain Capital and TPG. The firms are reportedly interested in the chain because of its growing mobile phone business. Rival Best Buy was said to show interest in RadioShack, but that retailer is already growing its own mobile offerings. Blackstone's former big retail acquisition was the purchase of crafts chain Michael's Stores, which is posting strong sales and earnings of late. A few years ago RadioShack's model looked obsolete, but the chain posted quite a turnaround. Would its growing mobile business and thousands of store locations mean a strong payoff for investors?