Buying Colloidal Silver

I know everyone says its easy to make but I rather buy it. I was wondering if any of u have bought Colloidal silver and what brand u bought as well as how many PPM it had and if it worked or not. I see a lot of threads on people using it most were homemade though

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I buy Tiresias Mist. It cost $20 for an ounce on ebay shipping included. It works like a charm but is expensive.
You can buy CS on amazon. Make sure to get 50 ppm or better. That should work.