Add Ecommerce to Existing Website

Current website needs to have ecommerce functionality added, using current website design/template. Please read entire project description before bidding. Only experienced and detail-oriented providers will be considered. Ecommerce platform should be PHP based for Windows hosting. Will consider any suggested solution as long as it is user-friendly, Paypal friendly, allows for unlimited products, flexible product options, is SEO friendly and is complete in its functionality. Ecommerce application must include product search by Brand/Model Number. Project timeline is 30 days from project acceptance. Must provide at least 60 days support after completion and implementation of project. Winning provider will be chosen based on price and experience. Must be able to demonstrate experience with suggested solution and similar implementation with examples. When placing a bid, please PM with the phrase "ecommerce " included in the message. If you ignore this instruction, I will ignore your bid. My maximum budget for this project is $475. Any bid over this amount will be ignored. I am familiar with many open source ecommerce solutions and their functionality. I am posting this project due to time constraints. If you are proposing using one of these, include the name of the solution (eg. oscommerce, magento, CRS Loaded, ZenCart, etc) and specifics of the process for integration. I will only choose an EXPERIENCED PROVIDER in the solution that they propose. I will also consider a custom solution as long as all functionality and integration are included. Please PM me for website URL and with any questions or comments.