Several options recently from Black Bear. FMM currently has a plain sytle koa concert for $500 and a Koa fancy style soprano for $600.
BB just recently offered 5 koa style 0 sopranos for $350, which is the deal of the year. While these do not feature curly/ornamental wood, I'm sure they offer great sound, as Duane (Black Bear) doesn't do anything that lacks quality.