Hi,Jim. Check magazines like Old House Journal. They have ads for these products. If your repair area is not too big, use a Dremel tool or a carving bit in your regular electric drill and carve all the punky wood away. Then fill the hole with automotive Bondo. You might want to use masking tape or duct tape to hold the Bondo in place. Remember that you only have about 5 minutes after you mix the Bondo to get it in place and 20 minutes before it is hard enough to sand.
The stabilizers are really not much more than slow drying polyesther epoxies, so they will soak into the wood. That is the theory anyway. I'm not convinced that they will soak that far in to good wood. You can use regular polyesther epoxy for this if you wish and still use the Bondo. I think that you will find this to be a lot cheaper and work just as well.
More important than all of this is changing the pattern that allowed the dry rot to start in the first place. Fix your gutters, change the pitch on your porch or do whatever you have to do to keep water from setting in one spot on your wood.