PHP Web Robot required to find individual requests

I am developing a website which will give customers a quote for a particular job based on the uk postcode. I would like to get the customers postcode and use this to get a quote from another website that also provides quotes. This price would then be returned and used within php to calculate my quote for my customer. This is so that my quotes are always relative to this other website's prices. I do not have access to the other website's back end so it would be front end access only so a robot would be needed - perhaps using CURL. post variables would be needed to be replicated unless you can replicate pressing a button. The front of of this site has not changed for a long time and is not likely to change again so assume it will not change. more details: ----------------- Spec: we would need a [login to view URL] which can accept a postcode passed via post request. The price from the external website would then be placed within a variable at the end of the [login to view URL] page within the source. This will allow us to take this value and work with it as we wish. ------------------- Regards Marriog