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I am not sure what legal zoom charges to file for a copyright on your manuscript. That said, it is quite easy for you to file the manuscript yourself on the US Copyright website via their on-line filing system. You first need to register with them by providing some contact information, email, etc. You will be provided with a user name and password. You may then proceed to file yourself. All you need is a digital copy of your manuscript (preferably pdf).
They actually walk you through the process of filing, which takes about 20 minutes. You pay the filing fee (~$30) and then you submit your work for copyright recognition. They will normally notify you within about 6 months that your copyright has been granted.
So, the combined fee if you do it yourself is about $30. It is very easy to do as well.
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Best wishes going forward!