Los Angeles-based comparison shopping site PriceGrabber.com said this morning that it has launched a new comparison shopping engine for cell phones, plans, and accessories. The firm said that it now offers shoppers the ability to find and compare cell phones from multiple carriers and resellers. The search engine gives the ability to search by minutes, monthly cost, or available phones. The search engine also said it is working with online wireless phone and plan provider InPhonic to search for available plans.