I'm wondering if anyone is aware of a low, or no cost source for data on the largest marketplaces that allow third party sellers? I've found a few sources for this information like Similar Web, but they don't offer this data as part of their free trials, and they don't publish their pricing which makes me think it's probably extravagant.
I'm not trying to do any keyword research or anything like that. I'm Just looking for a list of perhaps the top 250 ecommerce sites, or maybe the top 100 by country, or something like that. Does anyone know of a competitively priced or free source for this information?