Whenever I go into stores, I try to remember prices of nearly everything there. This especially comes in handy in grocery stores since you can usually see that the prices bounce up and down with predictable periodicity. By purchasing items that are on the lower end of their price cycle, you can usually save up to about 25% of your grocery bill. Most people only have experience doing this with retail gasoline prices, but the swings in gasoline are typically around 5%.
Note that this does not apply to items like fresh produce – for this you have to wait until the fruit/vegetables go in season, so it means in spring time that you have no chance of getting good prices without a corresponding sacrifice in freshness.
I really wish there was a way to automate the process of mentally recording prices since the mental database contains plenty of errors and is not as comprehensive as I would like it to be. Of course, the only way that most modern grocery stores keep in business is by dynamically shifting around prices and getting people to buy products that are priced at full margins, so the more alert shoppers will at least be “rewarded” for their mental work.
So when it comes to boxing day, I always find with amusement the “promotions” that certain places offer with respect to products. The highlight for this year had to be a certain furniture store that was advertising a certain article for $249 before boxing day. After boxing day, they replaced the tag with a $355 price tag, and then that was crossed out and replaced with a “Boxing day sale! Everything is 30% off, now $249!”.
The only caveat was that the item was now an “as-is” sale, with no recourse for refund or exchange if purchased.
I went along my merry way, knowing that after this “sale” was over with that they’ll probably be marking it down to $199 in due course.