A while ago I took an old sturmey archer 3 speed hub into my local bike shop to get a rim and spokes for it. (This is before I started reading Mr. Money Mustache.
He didn't have a rim in stock, but would try and get one for me. He'd been having some trouble getting one, looking into it for quite some time.
I decided to go into the bike shop to tell him that if he hadn't been able to get one yet, don't worry as I could save the money for my retirement.
He had managed to get one though, so I paid for it and the spokes which cost $120 ($60 for rim and $60 for 40 spokes at $1.50)
This was bad enough, but when I was having a browse, I saw a helmet I really liked
http://www.nutcasehelmets.com.au/products/nutcase-street-gen3-union-jack It fitted well, and was comfortable. I justified it to myself saying that I ride my bike everyday as my primary mode of transport, and my old helmet was about 8 years old and didn't fit very well.
He sold it to me for $90 NZD which is less than the $99.95 AUD as shown on the website.
Really though today was some large expenses which I didn't need to make, please punch me now!