What's the cheapest way to close a cash sale?

[Eric Belgau]

We're buying 6 acres of undeveloped land adjacent to our primary residence, creating a privacy buffer for now, but with an eye to developing it down the road. We're buying with cash directly from the seller without a Realtor involved, and we have a good enough relationship with him that he'll close however we chose.

So in Washington State, what's the cheapest way to close? Any insight will be greatly appreciated.