Hi,
My name is Richard and I am from New Zealand.
I am an enterprise software architect by day and freelancer by night - which is about the time you become active being antipodean?
My understanding of what you want:
1) a program (or Windows service) that will run in the background and continually poll one or more keywords on a website
2) when a match is found (on any page), it will automatically add item to cart and go through check out process
I would need to go through the checkout process a few times to make sure I've got it down pat - so a portion of the costs will be used to actually but something. A few somethings at minimal cost, I hope, should be enough.
I look forward to hearing from you.
Regards,
Richard