Costco offers great money saving deals, but sometimes the best deals aren't always obvious. Because of this, Business Insider reached out to dozens of Costco employees to find out the best strategies. One employee said that if you see something you really want at the store, don't hesitate just buy it because many items are seasonal and won't return. Other employees advised avoiding shopping at the store on weekends if possible. Tuesday is reportedly the best shopping day at Costco.