here's another LPT in the same vein...

delay your purchase.

you might see a thingy and think "wow, it ain't cheap but i just gotta buy that thingy!"

hold up. wait a few days and cool down. think about whether you really need it and whether you can really afford it, and, like this LPT says, how many hours of work it will cost.

i've avoided the purchase of many thingies by delaying a few days, and it's surprising how i soon forget about the thingy