Need help refreshing and checking out an item online

[floom]

I really need help purchasing an item for a xmas gift online.

It's going to be released soon and is limited. I would really like to buy it for my family, but last time they did this, it sold out in seconds online, literally in seconds. I am just sick of not being able to get it for someone every time it releases. Is there anyway for me to be prepared to buy it? Like I heard some people use scripts, auto checkout programs, autofill (both for shipping info and credit card info) and all that good stuff to be able to check out as quickly as possible. In addition, I need to keep pressing F5 so that I'll be able to get my hands on it as soon as it drops. I currently have what's called reloadevery, but it seems like when I set it to reload every 5 sec, it literally reloads every page on that website. So I am worried that it will reload while I am filling out my shipping info, and thus I would have to type in my info again.

Btw, I use firefox. What should I have installed to have it reload every particular second only on that page, checkout immediately, autofill shipping and credit info, and finally have it automatically click finish?

I really need you savvy techs to help me out here. I know there is someone who can help me out.

Thanks a lot and have a good day