I find that the toner I make myself works better than anything I have bought. It did take some tweaking to get the exact shade I want and I still play around with it some but I thought I'd show a video I made of some of the process. My favorite color to use is violet but it also depends on the base color you have.
Hair on a Budget - Making White Toner Using Manic Panic's "Ultra Violet"
You can also do the same thing to make "silver shampoo" but there needs to be a bit more dye. I did this for a while but then stopped because I found it more useful to add the dye to my conditioner instead.
This method will also save a lot of money as one jar of dye can go a long way. As for conditioner, I usually use the cheapest I can find.
I never new this!!! Wow nice!!!!! Thank you!!!