Hello Sir,
I would love to work with you on your project. It was hard to give you an exact quote, not knowing exactly how many listings you have each time. I would love to know more and be able to give you a good bid.
I have done a project like this for a search engine for over 4 years. So I know exactly what you are wanting done. I would love to work with you on a long time project. Please PM. me and lets talk some more. I am in the USA and have broadband internet. Waiting to hear from you.