Walmart offers the LEGO Architecture Flatiron Building, model no. 21023, for $23.78. (Amazon charges the same, with free shipping for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping charge. That's $2 under yesterday's mention, the lowest price now by $4, and the best deal we've seen. (Most stores charge over $30.) It includes 471 pieces.