My wife wants to buy and try Japanese rice .

She looked at big c , tesco and tops and couldn't find it there

Any one know we're she can get the rice in Nontaburi or Bangkok

TOPS usually has it, as does Villa, Gourmet Market, Freshmart. In fact, any of the upmarket supermarkets.

For a better range, go to MaxValu which is part Japanese owned. There's also a Japanese supermarket, UFM, on Sukhumwit Soi 49.

According to their websites Big C and Lotus both stock two brands of Japanese rice:

http://www.bigc.co.th/food-beverages/dry-food/rice.html?dryfood_rice_type=4831

http://shoponline.tescolotus.com/en-GB/ProductDetail/ProductDetail/6009643052

http://shoponline.tescolotus.com/en-GB/ProductDetail/ProductDetail/6018747701