just like we did at target. >> see this little number in the upper right hand corner. that is the percentage off the original price. >> originally $19.99. that would be 70% off. >> reporter: at home depot pay attention to the last two digits. .06 means six weeks to the next markdown. .03 means three weeks to markdown. and watch for asterisks at costco. prices ending with 97 with an asterisk in the upper right hand corner, jackpot. james says it is a clearance item. >> i have this tv. bought it at costco. i know i paid a lot more than that and there was not an asterisk when i bought it. >> reporter: while home depot and costco say they won't discuss pricing, target says it is impossible to determine the final price or timing of markdowns based on the numbers. james' secret weapon. often the store employees themselves who confirm the inside information. >> that's insider stuff. you're not supposed to know that.