$800 - $900 sounds like the price range I would expect as well, although I hear that Honda recently took steps to cut down on mail order sales. so perhaps the price has gone up.
In order to use 2 EU2000 together, you need a synchronised power cord. The original cord from Honda was about $280 and then needed an adapter to use with an RV. I hear they have a new cord which can be used directly. Wherever you get your generator, see what kind of a deal they'll do with 2 generators and the cord.