I would jump at the chance of getting a working or repairable 7104 for 100eur.
In the recent UK sale, with condition unknown, arrange your own packing/shipping:
Tektronix 7613 oscilloscope, 100MHz inc: 7A18, 7B53A £10
Tektronix 7603 oscilloscope, 100MHz inc: 7A18 trace amps, 7B53A dual time base £11
Tektronix 7704A oscilloscope, 200MHz inc: 7A26 trace amps, 7855 delay time base, 7880 time base £10
Tektronix 7704 oscilloscope, 200MHz inc: 7A26 trace amps, 7885 delay time base, 7880 time base not sold
Tektronix 7704 oscilloscope, 200MHz inc: 7A26 trace amps, 7885 delay time base, 7880 time base £10
Tektronix 7603 oscilloscope, 100MHz inc: 7A18 trace amps, 7B53AN dual time base not sold
and I'm sure there were others, but I can't be bothered to find out!