AMD originally put out those kits as a high priced premium kit. BUt I think they realized that nobody is going to spend i7 money on an 8000 series CPU, even with a water cooler. They are cheap now, but only as clearance items. If it was a new liquid kit with the 8350, it would probably be $250-260.
If you HAVE to have it, you can buy an 8150 liquid kit for $180, sell the processor on ebay for $140-ish and pay about $60 out of pocket after fees, etc for the cooler. One sold for $50 on ebay the other day, so you might find one that way.