These books are all great for frontloading information before building Leprechaun traps. I suggest reading at LEAST one of these before starting the tradition of leaving Leprechaun traps on the eve of St. Patrick's Day.
You can buy a “kit' but that is just not the same as having true discover and exploration. In addition to these supplies, I strongly recommend using recycled and repurposed goods and ”trash" from around your home.
I love homemade, but if you simply don't have the time but you still want to create lasting memories with your kids these could be good choices!