By: Cristina Martin Yes, you heard it first from us! Balenciaga is having a one day sample sale near Union Square. The sale ends at 5:00 p.m. today, so sneak out of your office ASAP. When we posted about the sale in the morning, people had no issues getting in. Once the brand got wind of the ShopDrop effect, they started turning people away. Our advice, email from a personal…