When the old mechanical cable release for my GSW690 and RB67 finally fell apart, I replaced it with a new inexpensive 70cm cable release (less than $10) purchased on eBay.
A little advertisement for premium quality (made in Germany) : https://www.drahtauslöser.com/SESSION/10406/P3.html
Though I have to agree with Narsuitis ... I bought mine used (pictured above) for 5 EUROS from evilbay and it does what it should ...