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How much do they cost over in the US?
Here is Aus we can pick up a RTT for around US$450.00.

you are looking at closer to $1000 US to start for any 'name brand'. There are, of course, Chinese no-name imports that you can get a bit cheaper. and of course you can always pay a lot more... the 'hard shell' tents are pushing $4000

WOW! That's pretty steep.
Here too some of the established brands go high as US$2000, but at the same time, we have new local brands entering the market. The quality standards are pretty good. These start from around​ US$450. Three years back a friend of mine bought for US$550. Has used it extensively. Still going strong with no problems at all.

Yea, it seems a bit ridiculous for some canvas and a few tubes... (I know there is more to it than that). $400 for 'base' and $800 for 'delux' sounds a lot more reasonable to me.