Cosmic rainbows are good in general.
So, yeah, figuring big ones are very good.
For the smaller ones, Cedarman got $4.99 to $12.15 in the recently completed listings.
Someone has a blue and yellow 7/8" listed at a BIN of $22. Might have a small crack in that one -- or that might be a fiber.
... not a lot to go on ... but maybe it helps a little.