CD Repair?

I have bought used CD's at stores that specialize in it. They
all looked brand new.I asked the employee's about it,and they
responded I don't know.The jewel boxes looked bad.My guess is
they sure are doing something to them.I've seen CD scratch removing devices selling in magazines $20-40 or so,but know nothing about them.If the CD is that bad,it might be something to try?Here's a link to what I've seen.link >>[http://www.pcmag.com/article2/0,2817,1835760,00.asp]

I've read in an audio magazine years back,if the disc has a large scratch or hole,somebody suggested tapeing a peice of aluminum foil shiny side on label side to reflect enough light to make a copy.Make sure it is secure on label side. I have not tried this.