I refer the honourable gentlemen to a
thread I created a couple of days ago.
Those prices are direct from Nikon in Thailand. You may not be able to read Thai but you can verify those prices by visiting
www.nikon.co.th. Take your passport wth you to the shop, so you can fill in the VAT Refund form when you make your purchase. You can then claim 7% back when you leave the country (you must do this at the customs office
before you check in your luggage!!!).
If you email them using the email address on the contacts page they normally reply within 24 hours and will quote you prices.
If you're not familiar with Bangkok but you know where you are staying, post the hotel on this thread and I will tell you where the nearest authorised Nikon Dealer is (and you won't get ripped off at these shops, I can vouch for that as I have bought all my lenses, flash guns, camera etc from Thailand).
Whatever they quote you, when you go in person, negotiate a further discount!
P.S. They make Nikon cameras in Thailand.
Edit:-
I'm not a Canon man, but their website lists their authorised dealers
here.
Having just had a browse of the Canon dealers, I note that they have 2 or 3 authorised dealers at MBK. Nikon have Sunny Camera there as an authorised dealer (I've used them personally). Point I'm trying to make is that MBK which is a large shopping mall houses authorised dealers for both, it is also very convenient to get to using the BTS Skytrain as it is connected by an aerial walkway from the station. The BTS station you need is "Siam Square".
There are a couple of camera shops on the ground floor where you can buy/sell second hand equipment, you'll need to be on the 1st, 2nd and 3rd floors to find the dealers.