There are over 500 products in the software category at Best Buy, including different categories, platforms, brands, and operating systems.
Walmart is famous for offering a huge selection of products at really low prices. You will find mostly anything here.
Groupon is a great site to find discounts and coupons when shopping online. You can shop for products such as watches, electronics, and sports & outdoors.
There are over 200.000 software products in the software category at eBay, including over 30.000 office & business items, over 40.000 other computer software, etc.