East Coast Towbars have a deal on GrabOne for towbar fitting and wiring that was $550 and is now $318. - Only 1 day left on deal
Must be used by 2-Nov-2018.

 

I've used them a couple of times myself and they've been mentioned a few times on GZ before.
My current one was fitted about 5 years ago and cost about $400 then. 

 

If you are looking to get one for a bike rack they had what I think was called a 4WD option.  Basically they weld a fin under the towbar for extra strength.
This works well to minimise "bounce" if you have a few bikes on the back.

 

They are a bit out of the way but if you book ahead for a Saturday you can wander down the road and go bowling for the morning