Supermarkets

I am increasingly frustrated with the way that supermarkets display their pricing. Having a price per kilo or per item price posted but no price stickers on stuff makes it very difficult to keep track of how much I'm spending, even though I shop from a list. For some reason, I don't get much from the bar code...it it just me??
I find 'price per kilo' useful when comparing the relative cost of things, but most of the time, I find myself scanning around the shelves, looking for where the price is displayed, often getting fed up and chucking the stupid thing in the trolley anyway- which I'm sure is the idea.