You can get a whole set in a rainbow of colors from Four Guys Guns:
Inspired by the work of 5andaDime.com and as a tribute to the coolness exhibited by our boys on the frontlines, the riflestash is now available so everyone can stop the search and get a sweet ‘stache on the medium of their choice. Available in 10 colors to match your style or needs, we put them on our buttstocks, just because we wanted to. What you do with yours is your business. 1 order equals 1 sheet, 1 color of your choice with 4 styles on the individual sheet. You want more color, you buy more sheets. Mustache rides are free, but you gotta get the ‘stache first.