Hello.
I'm a programmer with about 9 years experience of web-development.
About the project:
Based on libraries for auto-testing (Selenium) we can build such script, it will work using Chrome or Firefox, will be built on Node.JS, so can be run everywhere where it is available. All of it shouldn't take long, depending on the rules and conditions for buying.
Will be glad to work with you.
Best regards,
Kamil.