about shopping on website

pandun1234

Today more and more people prefer to do shopping on website.We have popular shopping websites such as taobao，on which one can sell as well as buy anything legal as long as he has an account.We also have websites which only sell certain products,ie.AMAZON sells books and VANCEL sells clothes.Recently we are having websites,which sell products or services at a very low price,as long as there are enough buyers.We call it group purchase.
Hv you ever do shopping on website? Which way of shopping do you prefer?Show me the reasons.