E-Commerce Website design and build

Please can you provide a quote for the design and build of an e-commerce website with a T-Shirt design engine that would allow customers to add their own designs/images to t-shirts/clothing prior to ordering them from the site, I would also require a boutique page within the website to sell pre-designed clothing.
An example of the type of website and quality I would want is www.streetshirts.co.uk

Thank you for your time and efforts.