If the camera is less than 2 years old, you might check how you paid for it. Some credit cards cover items beyond the manufacturers warranty, usually a year. Depends on the card, and even if some coverage is offered it varies company to company.
As others have said, trying to save this camera is a wasted effort with the salt water. In days of long ago, when a 35mm got dunked in salt water they told you to immediately get it into fresh water (on purpose) and actually take it to the camera shop while immersed. I once dunked a Kodak Retina and didn't have the luxury of fresh water and could actually watch the leaf shutter rust. In a matter of minutes it the leafs were fused due to rust.