A 'scope, though is worth getting. An old, valved
Tektronix is still a
good instrument, and you can get them for <$50 in the UK.
I've got a valved Tek, a 314, IIRC. It has a round display, not square.
I bought it at an auction five years ago at EG&G (a defense contractor).
The scope has an Atomic Energy Commission inventory sticker on it, probably
the coolest thing about it.
-ethan