Got a few goodies today at thrifts and the warehouse

While going through the warehouse today a came across a 59 page document titled OSI Challenger SYSTEM PROSPECTUS. It sold for $1 and looks like it was printed before May of 1977. It has allot of technical information in it. At a local thrift picked up a Commodore Minuteman MM3S calculator with square root key for 99 cents. Good shape (looks) but not tested yet. At another place got a Monteverdi TV Sports 825 model E825A with one controller for it. They had two controllers there for $2.99 each but one was broken into pieces, so I left it. Also there was no power supply or instructions with it. Also at the warehouse I picked up a TI2500 in the box that I had there and a Laser 50 PC that was billed as a educational computer and had 6 modes you could work in. It's missing the battery cover on the back.