Groupon has the K’NEX Mario Circuit Building Set priced at $39.99 right now (Reg. $107). Shipping is free. The exact same item is selling for $88 on Amazon! Snag this one up and save it for Christmas or a birthday.
The Fine Print: Limit 3 per person, may buy 2 more as gifts. Free shipping. Does not ship to AK/HI/Canada/Puerto Rico. Most orders are delivered within 2 1/2 weeks from the purchase date. Does not ship to PO boxes. FINAL SALE; no returns unless defective.