Seems like I am often in search of teh most random things. Todays quest - 3" wooden balls. Premier Wood Products has them up to 18" in diameter. Don't expect it to come cheap that large though - the cheapest (pine poplar or mapple is $683, and other woods can run up to & over a thousand. They have other items - appliques and overlays, corbels and brackets and columns and pilasters among others.
Casey's Wood Products also has a wide varity of items, but they tend more towards game pieces, starts and craft cutouts than architectural details.
Woodworks, ltd. has a wide variety of wooden shapes & also sells wooden kitchen utensils.
Bear Woods has turnings, including balls, as well as clock parts and other craft items.
Craft America has a crazy assortment of wooden items acrylic items, as well as much more. It's an odd collection of craft stuff.