It depends upon which eCommerce platform you choose to build site like Amazon or eBay. If you choose Yo!Kart shopping cart solution then you can build your similar website in a small cost of $250 with following features:
-An android app that will help you not miss smartphone audience.

- Hosted solution

- Multi Vendor & Multi Store Support

- Responsive website

- Scalable

- Three layer security that will safeguard your store from both client side and server side as well.

- SEO friendly website that will help your online store to easily come up on search engines.

If you are planning to start your daily deals website, then you can choose yo!Deals for the same. With its enhanced features like product selling and multi vendor, you can start daily deals store in just $149 including installation. With product selling feature means, one can sell products too via daily deals website which no other daily deals script offers. Visit here http://www.fatbit.com/website-design-company/groupon-clone-script-packages.html to know more about this readymade daily deals solution.