Wow, the people working there are stupid. Yay for stupidity! Each time I get a price match anywhere the person always checks the date first...
Or maybe they have a one week grace period? I know that Crappy Tire did when I worked there, and it helped solve a LOT of problems involving people coming in 1 or 2 days late wanting to save 1 or 2 dollars on a 20 dollar item.