ACEO stands for Art Cards, Editions and Originals: a miniature artwork made at exactly 2.5"x3.5", the size of a trading card. Collectors buy them as small originals, often straight from the artist.

The title describes it as an original, made by hand. For a card you plan to keep, ask the seller for a signature on the back or a certificate of authenticity.

Yes, this seller accepts offers. A reasonable offer is close to the asking price; for small originals, a lowball offer rarely gets accepted and can sour a first contact with an artist.

A card at this level deserves to be seen. Use a frame or a magnetic holder made for 2.5"x3.5" cards, and keep it out of direct sun so the colors last.