Friendly’s BOGO coupon for Lava Cake Sundae ! This post may contain affiliate links. Please see the full disclosure policy here. Posted on January 7, 2010 Written by Mary Leave a Comment Become a fan of Friendly’s on Facebook and you’ll get a coupon for a Buy 1 Get 1 FREE Lava Cake Sundae. Coupon expires 1/10 so HURRY! That picture- YUMMMM. I’m SO NOT printing this coupon…. hahaha!