How much does it cost to spay a cat in California?

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My kitten went into heat two days ago. The poor thing is yawling all day and night and looking for a mate. She is a rescued kitten so I wasn't sure just how old she was. I thought I would spay her in a month or two before her first heat. Boy was I surprised! I am being very careful not to let her escape outside, but I'm a little afraid to let her have surgery at this time. I've heard it is a bit more dangerous while a cat is in heat. Could anyone let me know what it costs to spay a 6(?) month old kitten?