If you're looking for an inexpensive and robust sticker sheet design software, look no further than Silhouette Studio.
Even if you don't have a Silhouette machine you can use the software for designing sticker sheets. If you do have a Silhouette you can of course also print and cut.
Read on for how to use the Silhouette software to design sticker sheets. I have a separate tutorial on how to print and cut sticker sheets with a Silhouette machine.