You could always scan and print a new one if you can't source a new sheet. Assuming you have not applied the other one yet, scan it into your computer. Open it into any good photo editing program.
You can then copy the individual decal out of the scanned image, paste into a new file, reverse the image so it faces the right way, clean up any stray pixels, remove the blue color of the backing paper and print on decal paper. Heck copy and print the entire sheet and now you have backups.
If the image you posted is a high res image you can use it to print after doing the steps above.