It's probably not the stalk. On the back of the steering wheel, held on with 3 screws is the blinker return/horn ring. 99.9% of all VR/VS blinker cancel probs I have solved have been the black plastic tab on the horn ring that triggers the blinker to turn of has been worn or rounded on the corners & won't click the blinker off.
When you remove the wheel, have a look to see if the pllastic leg is sticking out from the wand - this is what the horn ring tab clips on it's way past to turn off the blinker. If that little white leg is still there & functioning, then it is definately the horn ring.
For non-airbag cars - with the 3 spoke steering wheel, the part number is VS21140 and it's about $14 from holden (trade)
For the 4 spoke wheel, it's part number VS20593, and it's $15.50 trade.
If your car has an airbag, then it's the entire clock sping assembly, and it's p/n 92044668, and it's just over $100 trade.....
The same thing goes for VS, but the non airbag cars use the 4 spoke wheel only, so it's p/n VS20593.
Airbag VS models have 2 types. Up to the end of 10/95 is the same as VR, then the later ones got p/n 92052663 - same price as the VR version.