Mobile Notary Cost and Mobile Notary Fees are determined based on location and quantity of required notary signatures. The Mobile Notary Fees range from $25-$75, in addition, there is $15 per notary signature. This price is per person who will need a notary certificate, for example: if two people are named on one document and both need to be on the notary certificate then the total cost is $30 plus the mobile fee.