Since we are heading into the "Back to School season" BJ's has a few Lego sets in stock again.
They have three sets at $16.99, 60115 4x4 Off Roader, 60116 Ambulance Plane, and 60118 Garbage Truck. That's a Price per Piece of $0.10, $0.09, and $0.07 respectively.
They also have 76047 Black Panther Pursuit, and 76034 Batboat Harbor Pursuit for $25.99. That's a $0.09 Price per Piece and a $0.10 Price per Piece respectively.
As always, YMMV and Good Hunting!