Great, over here in Europe it's not to be had for less than about EUR 950, and BestBuy don't ship to Europe and don't even accept non-American credit cards...
I will never ever buy from any company that will not accept ALL major credit cards regardless the country of issue. If I cannot rely on my credit card being accepted wherever I travel having a credit card is useless. Americans should really develop the same attitude: please refuse to deal with companies that do not accept some credit cards because when you travel you want to be sure that you can pay with your non-local credit card as well!
Regarding the actual deal, that must be tempting as indeed here in Europe the same lens is way more expensive (much more than US price + import duty + VAT). Companies play all sorts of tricks to try to maximize their profit globally. It's not just Olympus, and it's not just in electronics either. Even IKEA prices vary from country to country and if you live close to the border you have to check the price of each item to decide where you should buy which item...