Need a automatic add to cart bot/script

*Mod, if this is in the wrong forum, please feel free to replace it*

Hi,

I'm in search of an automatic add to cart and purchase bot for random art sites. I'm tired of missing out on new art releases for popular items.
What the bot must do is scan a sales page and when an item gets available automatically add it to cart and fill in payment info. Preferably this bot will be easily customized to random sites.

Do anyone know about a script like that? I could also be interested in freelancer building me this system.

Best,
PPOT