Data Mining Crawler

I listed php, but don't really know if that's what I need. It just required me to choose a skill. I need some software written. I have a handful of websites that all post data on a regular basis that I'm interested in. I'd like to have something created that can scrape or crawl these 4 or 5 sites, grab the data and populate it into a space that my team can follow up with from there. The sites are rights management companies for musicals such as [login to view URL] and [login to view URL] - on the MTI site, if you choose a show from the pull down menu, such as "Guys and Dollls" for instance, the show page comes up and there's a blue tab on the right with the title "upcoming" that shows the list of upcoming theatres that are producing guys and dolls. On RnH's site, if you choose a show like "phantom of the opera" there's a show page with a grey tab that says "now playing" and it gives several pages of theatres that are doing the show. There are a handful of other sites that list the theatres doing their shows and I'd like to have something that can pull all the data for me on a regular basis. I'd also like it to be able to pull the data on a regular basis and simply update the list that it pulled last time, so it doesn't have to pull the entire list again, just check it against the list it pulled last time and see what's been added. My team will take the data and research the companies doing the productions so we can contact them. The platforms that each of these sites use is different, so the paths are as well, but I need someone that can build me some software to do what I need.