The iRobot Braava 320 and 380t models (previously know as Evolution Robots Mint 4200 and Mint Plus 5200) currently have 10% discount at Amazon.
Shipping rates to WA came in at ~$40 for the 380t, and ~70 for the 320 (go figure, wouldn't have thought they should be too different, nice gouge Amazon)
Main link is for the 380t, link to 320 below (though for ~$60 difference after shipping 380t is probably the way to go)
http://www.amazon.com/iRobot-Braava-320-Floor-Mopping/dp/B00…
I believe they come with a 100-240V charger, so just require a plug adaptor.
EDIT: Discount is applied in shopping cart. Once added to cart, it will show a discount of $20/$30 in your cart.
Are you 100% that it comes with a 100/240v charger? If it does, I might consider purchasing it.