Would anyone know of a good site/ company to buy a flywheel/ clutch kit?

My dual mass flywheel is worn and I was looking to replace it, so far I'm leaning to the single flywheel route.

I've seen Sachs dual mass kits go for $600-700ish and was wondering if anyone had any experience with those. May go that route instead if the savings are substantial compared to a single flywheel.

Cheers