Amazon.com offers the K'NEX 1,138-Piece Sonic Blizzard Coaster
, model no. 50060, for $29.99
. With free shipping
, that's the lowest total price we could find by $27. This roller-coaster building set features two light-up coaster cars, motorized chain lift, speakers with line-in and headphone jack, and more. It requires two AA batteries and two AAA batteries, not included.
To get it in time for Christmas, order by December 19 with Super Saver Shipping, or upgrade to Standard Shipping and order by December 20.