Ummmm....about 4-5 years I think.
We have a Dogwood Festival here every spring, during it there's a Home/Garden show. There was a guy there selling them, and that's when we got them.
They were a bit more expensive, but I had called one time to order them after seeing them on tv, and the shipping cost was like 3x's the cost of the knives. So though the knives were more expensive, not paying the shipping charge made them much less. I think they were around $30.
Got a set of steak knives with the set.
They also slice through fingers quite well too.....