Chain Reaction Cycles sells a set of brand new Ultegra nine speed (6510) brifters for $270 with free shipping to the US and no sales tax. They also have Tiagra in nine speed for amost $100 less.

Used Ultegra nine speed sets go on ebay for around $150 to $175, sometimes higher (one recent used set went for $280!) Given the inability to rebuild them, as much as I like a deal, I would go with the new stuff myself. (Note, I currently have an ebay nine speed Ultegra set up on one of my bikes, but I got it well below the usual auction price. The key to getting an ebay item below market: 1. Look for buy it now, and buy it immediately. 2. Look for ones poorly described, lousy listing, poor pictures, wrong category, misspelled, etc. The set up I bought had both mistakes.).

Myself, next time, I am going with the Chain Reaction deal.