Custom Classified Website

I have now hired two seperate programmers for this job and both ended up flaking out! I guess that's what i get for hiring college students. I need a developer to create a new classifieds website for a niche market. The classifieds site should be similar too [login to view URL] and its interface and UI/UX. This should be fairly simple to create, but it needs to be built so that I can make minor changes to different fields as well as accept payments when from users that choose to post listings. I am looking for a developer that can provide great communication throughout the entire development of the site and also someone that can get the job done quickly and correctly with very few errors. This is a fixed cost project and I would like your fixed pricing. My budget is $500 and my time frame is 2-3 weeks. This is not a job which you can just use a standard template for. This will require coding! If you do not look at the site listed above to see what it looks like and how if feels to buyers and sellers then you will not have a solid grasp and understanding of what I'm trying to build. Please do not submit a bid and then show me screenshots of a standard template. For ease, I've attached some screenshots of the above mentioned site! PLEASE PLEASE PLEASE ASK QUESTIONS!!!! Don't just look at these images, but go to the site and play with it yourself so you have a good understanding of the project. The search fields I need will be slightly different, and there may be a few additional screens needed, but this is the basics of the site and it shouldn't be too complicated.