The ornamental design for a price-affixing machine, as shown and described.
FIG. 1 is a front perspective view of a price-affixing machine showing my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a rear elevation thereof;
FIG. 4 is a right side elevation thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken-lines shown in FIGS. 5 and 6 represent unclaimed subject matter, are for purposes of illustration, and form no part of the represent unclaimed structure.