RAPID HD31 Plier Stapler – $21.03 – 16.6 oz (Amazon)

This is a bruiser. The staples are huge and IF you can staple the cups– it takes strength — the staples are so big they look like rivets. If you worry about the cups coming apart or your sparkleball lasting 50 years, this is the stapler for you.
Staples: SuperStrong 8,10,or 12 mm which is the length of the leg of the staple. The 10 and 12 worked best for me.