[Steve Carlton]

I use Amazon Prime all the time. The item usually arrives 2 days later (sometimes sooner, rarely later) at my office (I prefer that to my porch). I know they jack up prices when they can, and I've heard (here I think) that they sense you're shopping if you don't buy or with click tracking or cookies or something that like that and reduce their prices.

I don't bother with that. As mentioned, the convenience is well worth it, especially not having to drive somewhere and waste time and gas. An Amazon is excellent about returns. I don't have to worry about them, especially if they themselves "fulfill" the order.