I would hazard a guess that you won't be able to find a dry or even semi-dry bowl blank in that thickness. It seems a rather odd proportion of diameter to depth. Your best bet would be to try to find someone with a bowl that has been roughed out that they would be willing to part with.
I do have one rough out in black walnut that will finish out between 7" and 8" high but the diameter will be in the 18" range, not 12".
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This bowl was roughed out last August but since I covered it completely with Anchorseal it is not dry yet. The scale I use to weigh my bowls only goes up to 11 lbs. and this one is off scale right now. There is a shallow split beside the tenon that looks like it should be able to be turned away since it does not show at all on the inside.
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I have finish turned a couple of bowls this size from the same log. I have put them back on the lathe and basically done a second rough turning to true them up and remove the Anchorseal, then started weighing them and watching for checks. Any checks that start I immediately hit with thin CA to stop them from growing. That has been successful on the ones I have finished so far and I was able to remove the shallow checks during the final turning. The last one took about 2 months to finish drying after I cut the Anchorseal off of it and new checks stopped appearing after the first week.
The big problem is that I am in Canada and you are in Texas, so shipping would likely be prohibitive for something of this size and weight.
Take care
Bob