Shop4tech offers the Spacerail Level 3 Steel Ball Roller Coaster Kit
for $27.95. Coupon code "MISS17" cuts it to $23.20
. With free shipping
, that's a buck under our mention from two weeks ago and the lowest total price we could find for this set by $6. (However, we saw it for $2 less in July.) This kit allows you to construct a "roller coaster" for steel balls (included) to navigate via gravity. Coupon ends October 12.