Try ebay and search based on the length you want. For instance search 8″ bracelet. I haven’t for a while but bought bunches of beautiful bracelets on ebay mostly from China. They ranged in price from $2-$4 and shipping was usually free. Plan on waiting a long time for them to arrive though. Large size rings are also available. For ring sizing get a set of ring sizers on Amazon which will tell you what size ring will fit every finger and thumb.
Another bracelet trick that works is buy anklets and wear them as bracelets.