Einstein Bros Friend Appreciation Day: Buy One, Get One FREE Applewood Bacon & Cheddar Sandwiches! April 30, 2014 by Rebekah The links in the post below may be affiliate links. Read the full disclosure.Print Email In honor of Friend Appreciation Day Einstein Bros is offering Buy One, Get One FREE Applewood Bacon & Cheddar Sandwiches, today only! You can either print the coupon or show it from your mobile device. There is a limit of one coupon per person.