How much does it cost to get an affidavit in us?

I'm curious to know, just how much does it typically cost to obtain an affidavit in the United States? Are there any standard fees that are universally applied, or does the cost vary depending on the state or even the individual notary public? And if there are variations, could you perhaps provide a rough estimate of the range I might expect to encounter? It's important for me to budget accordingly, so I'd appreciate any insight you can offer on this matter.