Too much $. You can get an outflow set with a spraybar for $10 on Amazon and other places. Just make sure that the set is the right internal diameter for your hoses.
Link please because I sure couldn't find one that cheap when I was looking.. everything was in the $30-40+ range and I wasn't willing to spend that much for something I could probably DIY if it came down to it.
Then I started looking for parts to make a DIY one and I realized I'd end up spending almost as much because I didn't have a lot of the "stuff" that some people have laying around (if I did, of course it could have been done cheaper, but I didn't have anything available to rig).
I did however find one for $15 on ebay that works wonderfully - it just had to wait on it to get shipped from China. Item #180489727574 is the one I bought... I was able to fit it to my fluval 306 right out of the box.