I am the designer of the fireflies used at Pirates of the Caribbean, and also the movie of the same name.
I am now offering the fireflies for home use, handmade by me, for $25 for a set of two. They work on 2 C batteries, and are dangled from their battery holder, which you add a hidden fan, to animate them, just like Disney does. Each firefly takes me hours to make, so I think the price fair.
For your convenience, send me your email address to [email protected], tell me how many you want, and I will send you an invoice from my Paypal account. The fireflies are weatherproof, and guaranteed for life.