cross-shopping
n.— «With more car dealers out there now than ever before, consumers also now have more leverage. It’s a common consumer tactic to play two car dealers off each other, or in auto dealer parlance, “cross-shopping,” to see which one can give you the best deal.» —“What NOT to tell a car dealer” by Kevin Ransom CNN.com/living June 27, 2008. (source: Double-Tongued Dictionary)