Amazon offers Prime members the LEGO Star Wars General Grievous Building Kit, model no. 75112, for $26.82 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.32. Also, Walmart and Jet.com have it for the same price.) That's the lowest total price we could find by $3, excluding the mentino below. It stands approximately 11" tall and features posable limbs, separating arms, and four buildable lightsabers.
A close price: Target charges $26.99 with free shipping.