The ornamental design for an e-book retail card, as shown and described.
FIG. 1 is a perspective view of an e-book retail card in a partially open position;
FIG. 2 is a front view of the retail card of FIG. 1 in a fully closed position;
FIG. 3 is a front view of the retail card of FIG. 1 in a fully open position;
FIG. 4 is a back view of the retail card of FIG. 1 in a fully closed position;
FIG. 5 is a back view of the retail card of FIG. 1 in a fully open position; and,
FIG. 6 is a perspective view of an e-book retail card in a partially open position according to another embodiment. The e-book retail card of FIG. 6 is identical to the e-book retail card of FIG. 1 omitting only the ornamentation of the dashed line.
In the drawings, the dashed lines represent perforations.