ah...the famous flowbee reelbar. interesting history of the flowbee guy. started out making vacuum attached hair cutting device. take the vacuum hose and attach the flowbee to the end and get an instant hair cut. not for me, but...
so back to the bar. $800 for a line manager? no way. offer $50.
that thing is ancient by the way. it was intended to be used to ride with any length lines. unwind and wind to your desired length. or when launching and landing...wind or unwind for a safer launch or landing. great idea and what not, but never took off and quite expensive as you can see.
for line management...do a search. there's a decent plastic product that seems to do the trick. but don't remember the name. turbo launcher comes to mind.