Update [11/7]: Sold out at Amazon, but still at Target w/ 25% coupon.

Usually ships within 1 to 2 months. Amazon has the VTech Marble Rush Ultimate 135-Piece Building Set for $24 - $6 off coupon (clip coupon) = $18 with free shipping. Target has it for the same price (Click "Save offer" on page; Exp 11/11, one-time use).

Color-coded blocks help you construct three different builds from beginner to advanced or create your own; includes 10 marbles.