Yeah, we already have a few extensions similar to this for viewing price history, such as Keepa. I use this one all the time since prices jump around so much;

Yeah, we already have a few extensions similar to this for viewing price history, such as Keepa. I use this one all the time since prices jump around so much; when I look at a product page on Amazon, Keepa inserts a big window with a price graph and other pickable info.