Create a Spanish-language webpage suitable for e-commerce

I need to build a strong e-commerce webpage for my paralegals agency. I have a basic webpage with the basic content of what I will like to believe will be the corporate identity of my business (colors, logo, etc.): [login to view URL] yet I need to move my website from a simple business-card to a full-fledge e-commerce website. My main competitor already has taken the lead in this area and his web page allows him to receive inquiries and process payments directly from his website, so the main goal is to beat his webpage with an appealing and costumer-friendly layout. My business is located in M?xico, so a working understanding of the language will be a plus. I received a quote from a local webdesigner office, they are asking for aproximate 300 USD. I have been told that any freelancers will be able to beat this price.