TRIAL MONTH AT EXCALIBUR GYMNASTICS - 3 One-month trial memberships at Excalibur Gymnastics. For new recreation-program students only. Limit is one certificate per student. EXCALIBUR BIRTHDAY! Make this a no-brainer. The top bidder will have a $199 gift certificate toward Excalibur Gymnastics hosting his or her child's birthday party.  To help make that party even sweeter a gift certificate to Norfork Ice Cream Company for a cake or a pie.