Ending only, Shop4Tech offers the Spacerail Level 5 Steel Ball Roller Coaster Kit
, model no. 231-5, for $44.95. Coupon code " JULY4TH" cuts it to $35.06
. With free shipping
, that's $5 under our January mention and the lowest total price we could find by $13. This kit allows you to construct a "roller coaster" for steel balls, included, to navigate via gravity.