If you look up reptilesaspets2010 on eBay they have some flat pack enclosures for sale if you want to get an idea for prices.
i know of someone on the gold coast that does them not really happy with his service tho kinda good price and he ships anywhere in aus thats where i got my flat pack from but got my new setup going now he does it with glass not perspex hes also working on uprights at the moment must be same guy takes weeks to get back to you on facebook even if you ring him he doesn't get back to you lol