Data Feed XML/CSV/PHP Import in a Prestashop website

I am looking for someone to do a site scrape of this site : [login to view URL] twice a day. The php/perl script have to colect all the categories, products, images, sizes, collors, etc and make a XML or a CSV file. After the file is made we need to import into a prestashop website. The script have to do that twice a day, with a crontab, and update the prestashop cart. PHP script have to check the XML or CSV file, and update the MYSQL database of prestashop only for products which have some changes (they are not available, or price was changed, etc). Also, is need to change the price in the shopping cart website, reduction/category, or increase by percent, etc. I'll give more details on PM. For Freelancers: Dont quote if you're not good in english. Budget is fixed to 250$. I'll not relase any milestone until i'm 100% satisfied. Happy bidding.