Back in 1996, they came across an outcrop of strange rhyolite lava flow that has been completely replaced and silicified resulting in a wide variety of colors including the bright ones that made the "Ocean Jasper" quite renowned. At first, the outcrop can be accessed only when the tide is low, and that's how they get the name of "Ocean Jasper" as named by Gem Shop Inc that first imported the roughs. I don't know why they're called "Ocean Jasper" instead of "Ocean Agate" since they're made of mostly chalcedony and greenish quartz (chlorite inclusions?) even we have similar dull green and yellow jasperized rhyolite coming from a nearby location, but whatever.
    The bright colors and eye-like structures of the Ocean Jasper have resulted in a high demand for lapidary purposes, but that also makes them quite expensive. Now they become more expensive when the source played out a while ago. It seems to me that the best materials already have been used used up (I have few in reserve for future), so the ones with best colors (red and orange) are becoming difficult to find.   The colors are usually white, yellow, pink and green and occasionally, those with eye-catching red and orange colors show up.
The reason why I put Ocean Jaspers under thunderegg section is because they share similar rhyolitic origins as the thundereggs. The "agate/quartz balls" seen in the Ocean Jaspers were once H-Cristobalite balls in perlite lava flows and the Ocean Jasper can be compared to "Morgon Town Poppy Jasper" Rhyolite formed under similar conditions.
    The best source is already exhausted and roughs are usually available via the sellers' back stocks.