Yes they are VERY pricey and I don't think you would ever be able to find one any who.
These birds are found in some zoos and perhaps one day will make there way into captivity.
If I remember correct their gestation period is 30 days and only lay 1 egg.
Crowneds are in the private captive market. http://softbillsforsale.com/softbills-sale.asp
is one site that has them for sale regularly-ish. Last ones up for sale were $2750.00 each, but $2500 per bird is more common. If buying, make sure you know about the different species of crowned pigeons and the subspecies of the Victorian crowned, so that you know exactly what you are buying. They are more complicated to keep than many colubiformes. Their diet is more complex for better health, they need a warmer range of temperatures, they need a *lot* of space, etc. They are very docile, and I know of at least one zoo specimen that will actually follow visitors around in an open flight cage. XD They only lay one egg, and inbreeding can be a problem for them in captive populations. They are a big chunk of change and care requirements is all, and not recommended as any sort of beginner bird in aviculture.
Being a very large chunk of change, scams are not uncommon for this bird. Make sure you know who you are buying from and where, and what protections are available to you through whatever channel you use.