All the LUK clutch sets I've ever bought are all new and I've had very good luck with Rock Auto also.
I always check Rock Auto first. Another option is Amazon.com. If you know what you're looking for and can be careful to verify parts numbers, descriptions, etc, they've started handling many more auto parts. Amazon actually has the LUK 04-123 clutch kit (the 9 1/8" diameter one) for about $104 and the 10" diameter one (04-003) for about $116. Both prices are higher than Rock Auto, but Amazon Prime will get you free shipping so if you're an Amazon Prime member and the Rock Auto shipping is more than the difference, you could look at that, too. Just another option.
