You could try a Command Button, Caption = "Sold Out", background =
transparent.
via, View, Toolbars, Control Toolbox, click the first icon (Design
Mode), select a Command Button and draw the button size on the
worksheet, then rightmouse and Properties to set Caption and
BackStyle.
Use a text box (which you get from the drawing toolbar). Type and
format your text. Size the text box and position it over your chart.
Click on the edge of the text box and format it with no lines and no
fill.