Best Buy’s Manteca store in The Promenade Shops at Orchard Valley is closing May 12.It is one of 50 nationwide that the electronics retailer is closing as it continues to struggle to compete with on-line competition.Analysts have noted Best Buy has been slammed hard by customers who use its retail stores as showrooms to examine products but then go on line to buy with Amazon.com being the biggest benefactor.Circuit City closed its Manteca store in the Stadium Retail Center plus their 566 other stores when they went into bankruptcy in 2009. JoAnn Fabrics opened in the vacated Circuit City space last year.Ironically, Best Buy’s marketing model was largely credited by analysts with driving both Circuit City and CompUSA out of business. The same analysts believe Best Buy could face the same fate at the hands of Amazon.com unless it reinvents its marketing strategy.Best Buy is trying to do that by initially opening 100 smaller stores to compete in the saturated but profitable cell phone market.