The ornamental design for a sales counter, as shown and described.
FIG. 1 is a right front perspective view from above of the sales counter showing my new design, the left front perspective view from above being a substantial mirror image thereof;
FIG. 2 is a front elevational view of the sales counter of FIG. 1;
FIG. 3 is a rear elevational view of the sales counter of FIGS. 1 and 2;
FIG. 4 is a left side elevational view of the sales counter of FIGS. 1-3, the right side elevational view being a substantial mirror image thereof;
FIG. 5 is a top plan view of the sales counter of FIGS. 1-4; and,
FIG. 6 is a bottom plan view of the sales counter of FIGS. 1-5.