I LIKE MUSIC
Super Member
For audio-frequency audio work, any cheap probes will be fine, even without the indicator pin.
E.g., these: http://www.ebay.co.uk/itm/Two-P6100...robe-100MHz-For-Tektronix-HP-CK-/192038517505
Those probes look okay.
I would be careful with any cheap probes for those that are interested. Some cheap probes will not even pass a square wave to look like a reasonable square wave, even at audio frequencies even with adjustable compensation. Using a square wave to help judge amplifier performance is not uncommon.
The bandwidth rating on some cheap probes is more of a hope than a reality. Some day you might want to look at the output of the RF front end of a tuner/receiver where it goes into the mixer. It is nice if the scope probes will do a decent job off passing the signal.
Mechanical integrity and durability can be questionable.