With the modernisation of Phoenix, which grew out of the official Community Edition of osCommerce, you can easily change the appearance of your shop and add features without any programming, using plugins and templates that don't require any changes to the core code.
This site features addons made for Phoenix Cart which are designed to be compatible across wide ranges of core versions and to be easy to install. Many of these addons are also available in versions made backwardly compatible to osC CE (also known as 234BS, Gold, Frozen or Edge) and even to classic osCommerce.
Not installed Phoenix yet? Get it here
Interested in UK/Europe-based or US-based hosting with built-in CDN? Shared hosting and Cloud Servers available Get it here
I am packaging and releasing a lot of existing customisation, payment and shipping modules so if you seek something not already here - just ask for it.
Integration with Avatax, Skubana, Easify, eBay, Amazon and others has already been implemented for customers and is in the process of being made into products.