Walmart offers the LEGO Jurassic World Dilophosaurus Ambush, model no. 75916, for $21.74. (Amazon has it for the same price with free shipping for Prime members.) Opt for in-store pickup to avoid the $5.97 shipping charge. Outside of the mention below, that's the lowest price we could find by $4, although we saw it for a buck less in March. It includes Gray and ACU minifigures, Dilophosaurus, a gyro sphere, and a truck.

A close price: Target has it for $21.99 with free in-store pickup.