web site developer computer peogrammer

We require a web developer/computer programmer to assist with the creation of a basic e-commerce site on an already established domain. We also need to have the site linked to a payment provider. The site can utilise a pre-fabricated template and doesn’t need to be created from scratch. We need to have the ability to list varying items for sale to the general public and be able to have said items paid for by purchaser via the site. We do not have an extensive budget for this project. Thank you.