Et tu, Google (GOOG)? An "extremely reliable source" tells 9to5 Google the search giant plans to join Apple and Microsoft in opening retail stores in the U.S., with flagship stores going live by the holiday season. Google's plans to directly sell its display glasses reportedly played a role in its decision. Hopefully Google will follow Microsoft's lead and feature OEM products to go with its own hardware, or else foot traffic could be light. Google already has "store within a store" partnerships with Best Buy and U.K. retailer Dixons.