New ask Hacker News story: Ask HN: Which niche online businesses would you love to own?

Ask HN: Which niche online businesses would you love to own?
3 by bhag2066 | 0 comments on Hacker News.
I'm looking for inspiration: Have you had your eye on a small website or piece of software delivered online, delivered seamlessly online (e.g. no sales team or implementation) that is just a great business but it's so good the owner won't sell? My example is BuiltWith. What is yours?