Answer: The scarlet maple you're looking for will not perform well in your hot summer climate, which is probably why you're having difficulty finding it locally. I wouldn't recommend growing it because the heat will dessicate the leaves in mid-summer. I did find one potential source for you, however, so you may want to discuss the probability of success with the grower:
Lemuria Nursery, 7820 Serpa Ln., Dixon, CA 95620; phone 707-678-4481.
Best wishes with your landscape!
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