The darker reality is that a fully functional analogue oscilloscope isn't going to happen EASILY for $50 in Australia, or anywhere else unless you've got a bottled Genie granting wishes
Seriously consider spending upwards of $120 to $250 for a fully functional analogue oscilloscope owned by someone moving on or upgrading,
that's looked after it, and not scared to demo it working properly or let you have a tweak.
Half trashed or intemittent oscilloscopes are more trouble than they're worth for a newb, hobbyist, repair tech or a EE that just wants to get on with it
Do the math: how much is a knackered $50 cro going to cost in time, and parts
if you can get them.
AND access them on the board without banging up other parts, avoiding sensitive 'unobtanium' components, 2000 volt zaps and much higher voltages.
If the calibration is miles off, and troubleshooting and probing waveforms via a service manual on a faulty device or any DUT, you are SOL in any direction.
$50 oscilloscopes are great for repair people that can fix and calibrate them, keep a couple (or MORE! lol) for themselves,
then resell at $120 to $250 to users that need to get work done, not crossing their fingers their test gear is working
It saves these great pieces of kit from the landfills, puts a few dollars in the sellers and repairers pockets,
and buyers get a classic WORKING oscilloscope for the price of a decent multimeter (or 2 tanks of petrol)
especially good news if cheap DSLows don't quite do it for them,
which may one day come in handy for practicing topedoes and dropkicks in the back yard Do yourself a favour and make sure your first analogue oscilloscope is a WORKING one and avoid disappointment.
Mine was a used -everything working- Trio-Kenwood 15mhz dual channel, still kicking goals 20+ years later