Better define "direct vendor" as you mean it then, since you're speaking to an international, multi-generational, multi-disciplinary audience.
I thought I did:
"For example, Tindie has a rather empty "flea market" section." Anyway...
Other marketplaces like eBay, Tindie, AliExpress, etc. "Maker-oriented" perhaps. Somewhere with a much better signal to noise ratio than eBay and AliExpress. I'm trying to think but my brain is
(FWIW, for anyone shopping on eBay, their recent changes have impacted "Best match" searches such that they return what's best for eBay rather than what's best for the searcher. Sellers offering "free" shipping and free returns are favored over true best matches. Same for sellers subscribing to promoted listings.)