Totally missed this at the time; Amazon has a fine arts section now (still labeled beta):
Consumers can navigate the site through medium (drawings, photographs, prints); subject (abstract, nautical, “the body”) and style (Realism, Impressionism, 19th-century), as well as by size, frame and color.
There are currently 503 works for under $99 and 2,517 works at $10,000 or more. The vast majority of offerings fall between those price extremes.
With Esty being over run my Chinese manufacturing this is a development that artists should keep an eye on.