Here are three better porcelain power insulators from right to left:

U-721 - Nice deep blue shade, may be a JD but has a sand rest base - tough piece! $25 (SOLD)

U926A - Fred Locke - nice mottled glaze, hard to read four line Fred Locke 6-1 marking $30

U-680A - nice JD blue, a single petticoat power style $20

All insulators in VNM or better (I don't see any issues!) -- Actual postage additional