Gregory's Server@Curator Ghost forms of animals are £20-£50, about $25-$60. These are intelligent spirits from my RuneQuest game. Rendered items for spot art, £20-£60, simple flat scenes, £20-£40.
The first £5 covers admin and non-art time, so bulk orders are a cheaper.
I also have a patreon at https://www.patreon.com/DianaProbst for original postcards sent straight to you, which are laughably cheap as they start at £15 with worldwide shipping.