. >> reporter: we asked shopping blogger dan to item us about the top three tricks. number one? the never-ending sale. that's when stores keep items marked down all year round. so it's a tale that is not a sale. >> reporter: it's the never ending sale because it is always on sale at that price, that can't really be considered on sale now. >> reporter: so, if it is always 50% off, it never 50% off. >> exactly. >> reporter: number two, the make and model mismatch, where stores offer to match a competitor's sales price but not really. you see a deal in the newspaper, it says, you find us a cheaper price on this product, we'll match it. >> that's right. >> reporter: you tell them, i found it, and they say, well -- >> depends on the product. it's usually on the cheapest tvs or the cheapest laptops where the model number is slightly different. that's all they need to be able to say. >> reporter: number three, the disappearing carrot. where stores lure you in with a super cheap sale item but they only have a few in stock. so they list products for a low price, you wait in line, you get