galaxy 3

I recently purchased the SGSIII White color. Can anyone recommend a good pouch or cover that I buy for this? Should I go for Samsung brand or something else? Also, are there any other useful accessories that I should consider buying?

The local dealers quote a price of 33,500 rupees for SGS3 with bill & warranty. He also offered another box packet without bill & warranty for 29K. Is buying this phone risking warranty but on other end saving 4.5K advisable? Has anyone experienced any bad things with grey product of Samsung...