Finders fee Real estate Agent, How Much is fair????

[Patrick H.]

Hey all, I called a agent to help me find MHParks to buy in a different town.  What would be a fair fee to pay the agent for bringing a deal to the table?  He sent me a buyers agent contract for a year, including a 4% fee due even if I don't close because of circumstances being my fault.  Im not signing that!  I was thinking a percentage up to a certain amount.

Thoughts??