(Bloomberg) -- Fix Price, Russia’s biggest dollar-store retailer, is considering an initial public offering of shares after winning the backing of Goldman Sachs Group Inc. early this year.The chain is looking at London and Moscow as listing venues for a sale in the first half of next year, and the valuation may be about $6 billion, according to two people familiar with the matter, declining to be identified as talks are private.An IPO is among the retailer’s strategic options, Fix Price founder Sergei Lomakin said when asked by Bloomberg News, declining to elaborate.