Do they give special discount or gift for first time customers

YES. They also have a bunch of discounts like Veteran's Discount - 25% Off, Student Discount - 10% Off, Senior Discount - 10% Off, Military Discount - 10% Off, Police/Fireman Discount - 10% Off and others.

They give you a gift for reviewing them on Google Maps, and then after 10 purchases you start getting 10% off.