I wonder if the product ran its course on HSN? They did offer them quite a bit and always had a TSV.
I bought a TSV about 2 years ago that was several brushes. I think I ended up with like 6 toothbrushes.
I found a site to buy the replacement heads but was really disappointed because they didn't change color to let you know when they needed to be changed, although they were Violife heads, not a knock-off brand.
Now I just use an Oral B electric toothbrush and all those Slim Sonic ones are sitting in my linen closet.