you picked up the domain Opti
no that wasn't it. this site went out in real time and got prices from many many stores.
some of these comparison stores data mine these online stores probably once a month and then create their own database to pull comparison results from. Other sites do it real time, bot goes off and retrieves the prices. At least i think that's how it works.
One guy who i was talking to, ran a bunch of price comparison sites, one was called adultdvdshopper.com(looks like he gave up), he told me he had to manually build his database of thousands of adult DVD titles and prices.
I said to him 'you gotta be kidding me. that is insane, there has to be a way with Net technology so you don't have to hire people to manually do this.' he said well since all these stores used different SKU codes it had to be done that way.
I looked at other shopping bot technology and it appeared to me that a good bot could do this without too much manual labor. But what do i know ....i'm not a programmer so i don't know what the limitations and challenges are in doing that kind of web app.