Yahoo stores is a application from where u can create a website with yahoo shopping cart. Yahoo shopping cart is now one of the worlds most secure cart and it also enable lots of features which other websites and shopping cart does not have. If you use yahoo store it also good for sale etc. For yahoo websites you need RTML programming language. If you want u can ask http://www.srssc.com to design the website for you. They are good in yahoo stores and experts in Search engine optimization.