I've made my list in highest sales, down to least sales:
1. Soap
2. Lip Balms
3. Solid Lotion (in the winter, mostly local Wisconsn folks)
4. Salt Soap
5. Lip Scrub (again, mostly in the winter)
6. Solid Perfume
I also just started selling my crocheted washcloths, soap savers & face scrubbies online. They sell well at craft shows, but I don't know how they'll do online. I'll be adding solid sugar scrubs to my online shop soon because I've had people ask for them, but locally they do not sell.
I no longer carry bath bombs, bath salts & liquid lotion, because they just didn't sell well. But that was locally at shows and stuff, so maybe they sell better online.
But over the years, I've seen from different sellers that their best sellers may be different due to location, or if they only sell online, how they package their stuff, etc.