Your best bet is to find an individual oversees willing to ship you a bumper. Go to www.ebay.co.uk and look around there. Even if the description says they will only ship to Europe, email them and ask anyways. Royal mail is the cheapest on shipping. I got my euro rear for total of $175US in good condition minus the paint.
If you want to get a brand new one, and money is not an issue, try and contact www.focussport.com He has some everyone in a while, but not cheap.