unreliable in regard to prices at Saisbury's

You can't really rely on the prices given for products in Sainsbury's. They are mostly wrong. This makes you miss some offers, because they don't show up. I always continue on to the Sainsbury's website to check the price given by trolley as they are so unreliable. They are wrong about 80% of the time. I then report the wrong price, but that doesn't seem to make any difference as the wrong price is still on there a few days later.