Here are three nice blue insulators as follows -- actual postage additional:

CD 154 MCLAUGHLIN-42, RDP, a nice cornflower shade, VNM -- $25

CD 213 HEMINGRAY / MADE IN U.S.A. // No. 43, SDP, great hemingray blue!, only two drips chipped and both on the back -- $22 (SOLD)

CD 145 (base embossing) AM. INSULATOR CO. N.Y. DOUBLE PETTICOAT (three patent dates), great deep blue, VNM and has a cool skirt indentation -- $25