Here you can buy some Rihanna merchandise:

01. JC Penney - buy clothes from new line "Miss Bisou" promote by Rihanna
02. CDuniverse.com - here you can buy some rare CD's, mixtapes, etc.
03. Ebay.com - CD's, DVD's, MixTapes, Magazines...they've got everything lol
04. Amazon.com - has all Rihanna's albums. Check it out!
05. Rihanna Store - buy various RiRi merchandise!
06. Nike Women Shop - as u know "S.O.S" promote this line so don't waste your time and buy something from Nike :)
07. HMV.co.uk - various singles & albums, sometimes you can find there something really exclusive.