I just recently got a good deal on a second-hand Hantek DSO1060 – not the greatest scope in the world at 60MHz bandwidth/2ch/150MS/s (note: sub-nyquist for two channel). However, for what I paid, it was a darn good deal, especially since I don’t have a true DSO with your standard math functions (my main scope is the Tek 2221a, which has both analog and digital modes, where digital has none of the niceties like FFT/multiply/divide).
Coincidentally, I also just found myself building from spare parts, then trying to troubleshoot, a computer that happened to sporadically restart itself with no obvious cause. After loading the bios, then noticing odd case fan behavior where it would spool up and down over and over, then noticing the BIOS reporting highly unstable voltages, I started suspecting the power supply. And out came the DSO1060!