$30/ $40/ $50 off with Min Spend of $149/ $199/ $249 Sitewide @ RedBalloon

Description from the site:

Select from over 3500 unique activities and things to do. We have experiences that’ll tickle the tastebuds of foodies, thrill the adrenaline junkies and rev-up the rev heads.
Simply use one of the following promo codes at checkout to knock some serious coin off your next experience:
MARCH30 - Spend $149 and get $30 OFF
MARCH40 - Spend $199 and get $40 OFF
MARCH50 - Spend $249 and get $50 OFF
But be quick! This sale will be over before you know it.
Promotional codes T&C's apply.

From the coupon code wordings, it looks like it will be valid only until end of March.

PS. They charge CC/PayPal fee of 1.95% for the booking that I made.