HomeRuns.com, an online grocer that serves the Boston and Washington, D.C., areas, changed its pricing policy to offer free service to orders placed over $125, the company said. The company has continued to refine its pricing structure. Two months ago, the Burlington, Mass.-based Web supermarket hiked service fees from $2.50 to $5.95. Webvan, the nation's largest online grocer, also raised and restructured its delivery fees this month. Five-year-old HomeRuns sent e-mails to its customers saying, "Many of you have asked us to reward customers on larger orders. We heard you."