The Panasonic 45mm and the 8mm lenses are not really the most popular lenses. The problem is not their quality but the very high price. But it looks like Panasonic is recognizing that and the price is now much lower than it was a few weeks ago:
The Panasonic 45mm f/2.8 OIS macro:
Amazon (Click here) is selling the lens for $788 which is $111 less than the original price (or $754 via third party resellers).
As usual we europeans do have to pay a much higher price. That’s why I usually my US friends to bring me some nice lenses from there when they visit me in Europe