Bot to scrap thousands of pages from classified ads website - repost

I need someone to build a bot to crawl thousands of pages of a classified ads website. This website maybe has an anti-crawl mechanism so our bot would have to use a few different IP adresses, have some kind of time management (to not crawl all pages at a time) and change user-agents as well. I don't think this would be very difficult for someone who already made this kind of bot. Literally several hundred thousands of pages must be crawled. Each page containing maybe 3-4 fields to crawl. The bot would run once every month. I don't need real time data. Also the bot should run either on a LAMP server or on my Mac. All data should be fed to a MySQL database. This is a repost for modified budget.