As with most purchases in Bangkok, buying the Nikon D7000 in Thailand should be safe enough. You'd be pretty unlucky to buy a fake camera but do make sure you witness the opening of a new box and check the contents. Nikon offers a world wide warranty but check that is the case.
Mark up on cameras is small and so you'll be lucky to get much knocked off and so we suggest asking for freebies like a spare memory card or a carry case.
Alternative PricesThe price of 45,000 Baht is for the body only. Adding lenses will increase the price quite a lot. Adding the 18-105 VR kit lens will take the price to 55,000 Baht or, when the price drops, 44,900 Baht.