I was foolish enough to buy Competetion Werkes kit. I spent well over $100 for the one I bought and was so dissapointed. It's basically cut sheet metal that corrodes, has sharp edges like a can opener and comes with poor, illegible instructions. Cutting was required with the F4i I bought it for. I ended up buying an undertail.
Cyclemall.net sold 02 R1 fender eliminators. Not sure about the 04. These were powdercoated and cost around $60. Not cheap considering you can make your own for a fraction of the cost, but the quality was there.
My advice is to make your own or wait for someone else to make their own design and start selling them on the forum or eBay. I bought a basic bracket off eBay for $25 for my 02, but accidentally sold it with the bike.