Free is great and barter works too.

A time ago 1993 i had a CO CO Tandy computer and worked it and got nice work done (spread sheet work) any way i asked a computer guru at the time is this old thing ok cause win 3.0 was around . I remember his answer till this day ."There will always be a better computer but as long as your computer gets the job done use it but when you need more then it can deliver then it's time to get some thing better. "
SO with that said bartering old parts for trashed ones I feel might have a long life possibility first many good parts are scrapped off the market and the few who save will reep the rewards as current computers from as far back as 1995 have abilities for just printing docs computers from the 2000's will be appreciated for plenty more time I am using one now (from the trash) a laptop but to bad my kids shorted out the key board with soda so i use it with a USB keyboard now