Where can you buy red lentils and what are the best brand of Fish Oil supplements available in Kunming.

I wouldn't advise you buying any vitamins in China. They are expensive and poor quality, in some cases even dangerous. There was an article in the China Daily about how farmers are even making fake red beans. They use dyes to make white beans red. To make matters worse, the dye used is not for eating.

These things are best found in Thailand.