$60 for 240ml (I think) bottle you need about 20ml for a regular sized car, so each bottle is enough to seal the car 12 times approx. (I'd say 9 to 10 times coz we all know that we're gonna be generous with applying it )
They sell it on carcareproducts.com.au (I am in no way affiliated with the site but I found they have an excellent range of professional grade stuff you won't find in autobarn, supercheap etc. Note that they have hardly anything from Meguiars which says a lot).