osCommerce is mainly slow project. There is no new release nearly after passing a year. Actually osCommerce main script is like skeleton for basic e-commerce requirements. You can add products to your store and customers can buy products..
But if you want to more features like Amazon, you need more then osCommerce. At this point the osCommerce users produced their solutions.
And there are lots of addons produced by users. Everyday users are adding new and updated addons to osCommerce Addons site.
By using suitable addons you can build a perfect store. Now we will look scripts that are produced from osCommerce.
osCMax
osCMax v2.0 is a powerful e-commerce/shopping cart web application. There are many advantages to using osCMax as your e-commerce/shopping cart for your web site. It has all the features needed to run a successful internet store and can be customized to whatever configuration you need.
http://www.oscmax.com
Download osCMax

Zen Cart
Zen Cart™ truly is the art of e-commerce; free, user-friendly, open source shopping cart software. The ecommerce web site design program is being developed by group of like-minded shop owners, programmers, designers, and consultants that think ecommerce web design could be and should be done differently.
http://www.zencart.com
Download Zen Cart

The osCommerce Project
The new osCommerce Project came about as the result of the lack of development of the original project, and is available for free as an Open Source based solution released under the GNU General Public License.
http://www.oscommerceproject.org
Download The osCommerce Project

CRE Loaded
http://www.creloaded.com
CRE Loaded Demos

I am only familiar with CRE Loaded and ZenCart. I love the simplicity of the two shopping cart software
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Most of the later ones seem somehow related to oscommerce, which is still ok when used with the simple template system [or similar]. I wrote a button generator http://www.kso.co.uk/en/tools.html for osc and others which does lots of shiny and textured button sets.
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The osCommerce Project created by disgruntled members of the true osCommerce forum is already in trouble. They seem to have lost all their corporate sponsors over their legal issues. More about their situations can be read at http://www.newoscommerceproject.org.
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Another oscommerce version is http;//www.ezOSC.com
ezOSC v2.1 is a turnkey e-commerce online store business solution based in osCommerce 2.2 RC 2a with a full supported IT and tech support staff. ezOSC v2.1 can be customized for any business’ needs with its open source. We have added additional functionality to this store by adding modules for every business to profit from. You need to have the edge over your competition with modules that will set you apart from the rest.
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Out of oscommerce family zen cart and cre loaded are probably the best choice. They are better developed and have regular updates. For those who want to switch fm one oscommerce solution to the other – you may try cart2cart web service. This service automates migration fm shopping cart to shopping cart http://www.shopping-cart-migration.com
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