Total posts : 45366
Try a web search on “Dso Fft Usa” and you will see a 5 MHz scope in the $80 to $90 range. I know nothing about this other than what I read.
Also, try QRZ.com where they have a for sale section. You need not register to view this.
Luck can be a factor such as when I picked up a dual channel 20 MHz scope at an “antique mall” for $10. It was a gamble since it wasn’t working but the switches and connectors were worth this so I bought it. Turns out the detachable power cord (same as used on PCs) was bad and the scope works great.
Be patient and keep your eyes open since you never know what will turn up.