Once again the Perth Mint is producing Legal Tender "coins" for the Fourth movie, just as they did for the Second and Third Movies.

This time they are a little different, as the coins are rectangular, and have a lenticular image on one side (with the Queen's head on the other).

There will be three 1-ounce silver coins - Optimus, Bumblebee, Lockdown.

Their currency value is $1 in Tuvalu, but the set of three are selling for AU$315 (with free shipping if your order is over $400).

Limit of 5000 of each. They come in a special display box and with a certificate of authenticity.

The link has some nice gifs at the bottom of the page, of the three coins lenticular images.