Is there a way (or tool) to find the hot products in any niche?

Amazon Best Seller Lists?

Hi Jenny, it's going to depend on where and how they're being sold, I think. But it perhaps depends a little on exactly what you mean by "top". In many places, sales figures are (rightly) not available, so if you mean "top-selling" it may be very difficult to learn this. It may not even be possible at all.

I sometimes wonder, when people ask questions like this (and I'm not trying to be "funny", here) whether they're asking because they actually plan to promote themselves something that's already a bestseller (which I think is what many people plan to do, though I wouldn't normally dream of it, myself), or because they want to make sure they avoid promoting those items (which would be more like "where I'm coming from", myself). I think, on balance, the most popular products are - actually for quite a variety of reasons - probably among the least suitable for many affiliate marketers to promote.

I suspect that this is - in some senses - the equivalent, on a product-by-product basis, of the reasoning that some people apply on a niche-by-niche basis, asking which are the hottest/highest-volume/biggest-money niches. (The one thing which always seems likely to me is that those are going to be among the most difficult and perhaps least appropriate niches for any specific individual to try).

One of many ways to check is do a search on the most popular keywords and look at the ads that show up.

I would encourage you to leverage your expertise in a marketplace, instead of chasing sales figures.