website backdoor - open to bidding

Ok so i buy sneakers online but they tend to sell out fast... so i need a program that could scan for items IDs so that why i could add them to my cart faster. i would use these IDs and put them into a checkout link to add to cart early. just let me know which websites you can work with to backdoor. like endclothing, kicksusa, Mr porter, adidas Y-3, [login to view URL], hanon, mytheresa, matches, barneys, doverstreetmarket, ssense, jimmyjazz, footpatrol, cruisefashion, offspring, okini and other sites. Ok so i need a program that could scrape targeted sites.. Program would scrape for IDs of users & product IDS... Needs to make sure its running all sub links & marking IDS & #s & context words... Needs to scan it all correctly and export it in a user friendly format