If you plan on taking large doses. Like 8 + ounces per day to rid yourself of a serious infection it will pay off multiple times.

My Silver Puppy costs $190 for the deluxe set up. Works the same after 5 years. I haven't used any other silver products that work better.

You can make your own high quality IS(Ionic Silver) or CS ( Colloidal Silver ) with DW(Distilled Water) a current control and a stopwatch. Current and time determine ppm of silver. See Faradays calculator/equations. With making the silver yourself you control how clean the equipment is and how careful you are in making it. Your cost per 500ml @ 20ppm will be under $0.10! The silver wire or bar will last a very long time. I have been making my own for years and just built a generator for my two daughters since I now have grandchildern! They bought the silver and I built the generator (around $25.00) So now they have IS & CS to use and a nebulizer for colds & flu.

Wow! That's a great price if it's a good quality product. And whether you choose to purchase from a vendor on-line or in a local store, quality should be the main consideration. Are you getting what you're paying for? I can't tell you if the products from the vendor you referred to are good or not. But I can tell you that there is a lot of crap for sale out there that doesn't live up to the hype when submitted for laboratory analysis. Allow me to refer you to an informative web site where you can educate yourself on Colloidal Silver . It's unbiased and they're not selling anything. Go to: http://www.silver-colloids.com/Reports/reports.html?partner=37&gclid=CM-Y5ci-...
Near the bottom of that page is a chart showing the lab analysis of many of the " Colloidal Silver " products that are being marketed. It's a real eye-opener.

To address the home generator issue: after a lot of researching via the web and elsewhere, I decided to purchase a generator for my home. I chose the Silver Lungs system and yes it is spendy but comparing the cost of the unit versus buying a commercial ionic silver product from "Sovereign Silver" at $50 a pint, the unit paid for itself in about three months and my ionic and Colloidal Silver product now costs me the price of a gallon of distilled water. The Silver Lungs generator impressed me as a premium quality system that was well thought out and most importantly (in my mind) - SANITARY. It's a closed system with laboratory quality glassware and other hardware so it's easy to keep contaminants out of you silver solutions. The kit contains everything you need (except the water) to get into the production of high quality product and maintain your equipment. It will allow you to make both ionic silver and colloidal silver and comes with a professionally printed manual that will tell you exactly how to make excellent product the very first time if you follow the instructions. I'm very happy with the Silver Lungs system which I've had for about two years. I think I made the right choice and would purchase it again.