In my area Ace Hardware has NO TOLUENE at all. I checked all of them nearby. They've apparently never carried it. None of the personnel even heard of it. Maybe it’s banned locally?
D-limonene is MUCH BETTER than toluene. Its thousands of times healthier. People have been eating d-limonene for centuries. It’s present in lemons, oranges, etc., and in pretty big quantities. Orange oil is mostly D-limonene, and that’s used to flavor foods, candies, drinks, etc.
D-limonene has solvent properties that are very similar to toluene, so it can easily replace it in most techs.