I started to make such a video when my video editor crashed and I rage-quit that for the day. I also doesn't help that I never seem to get far enough to find the good items when recording. I guess I need to calm down and start working on a new trailer again.
I'm not sure about the price, but I went ahead and finished setting up for a Steam page, since I'd already paid for one, picked a price for Steam (one I'd have been happy to pay for something like this) and copied it to here since it didn't seem fair to charge different prices in different places.