When is something free or cheap actually expensive?

I have create a list of things that are supposidly free or cheap, but actually expensive. Please send me a comment to add to the list.

Things that break and you have to keep replacing them.
An example is found in my shoe closet. I buy cheap shoes for work, brands that constantly need to be replaced, instead of buying one decent pair. I am sure this costs me more in the long run.

Free but very,very crowded language/adult education classes/first aid or driver's training
Sure, you can attend for free, but isn't your time worth something? If you studied in a smaller class or you paid a qualified instructor, you would learn a language/graduate very quickly and actually be able to make money, drive without killing someone, or save a life. Your time is not free, even if the class is free.

Library books that you return late or lose
I once paid over $100 for lost library books that I had taken to work and left in the wrong place to be thrown out. Go to the library with a buddy, so at least one of you will remember the date.

Eye glasses that have the wrong presription lenses
Just like everything in life, eyes change too. Wearing the wrong lens means that you save money, but you may end up seeing poorly, or not at all, as you age.

Food that you bought on sale that is too close to the no use date.
This one speaks for itself. Is it worth getting sick by eating something that is past its prime?

Free online dating sites.
Call me shallow, but I only want to hook up with a guy who can spare a few bucks to find me. The old adage, you get what you pay for, was never more true in this particular example.