I am not a California attorney but from my research it looks like the cost of a seat belt ticket has more than tripled, now costly generally from $76 to $89 for a first offense, depending upon the county.
Fortunately a seatbelt violation is a non point moving violation. Unfortunately, it can run you about $150, or more to pay it. Do not fail to deal with this and go to warrant.
The fine is only a portion of the charge. Added to the fine are a plethora of court fees and cost. So while the out of state lawyer may be right about the amount of "fine," the actual cost will make the entire bill more than double the listed "fine.
But as the last responder said -- don't delay, get it paid or you will be looking at a whole lot more in the way of cost and charges.
DISCLAIMER—This answer is for informational purposes only under the AVVO system its terms and conditions. It discusses general legal principles, trends, and considerations and is not intended as specific legal advice regarding your question. This answer does not establish an attorney client relationship.
Seatbelt violations typically cost around $150+.
The more important part, as the last responder claimed, is the failure to do anything about the ticket. If you don't show up, you will likely face not only a warrant, but civil fees that will likely triple the original amount of the fine.
A Lawyer can aid you in attempting to keep the fines low; call a few and set up some free consults.