Most agree that Rodelization is not a "sure" thing. It is quite a bit complex and things need to go just right. It is possible, but as I mentioned above if you want to ensure fem seeds, colloidal silver is your best bet IMO.
Silver thiosulfate is a bit technique sensitive, requires caustic chemicals, careful measuring, careful storage, etc. You can purchase it But it's still a silver product, I'd consider it more of a related product than completely different. That said, if you purchase it outright you can easily spend $60/$70 dollars for a few ounces of a decent product versus $15 in some 0.999 % silver rods and a battery. To each their own I suppose.