Keyboard issues.

Yesterday night, I accidently splashed a little bit of water on my macbook keyboard;
It was in the vicinity as I opened my water bottle, which splashed some water on the keys.
I cleaned everything off, turned off the computer, took the battery out, dried it off, etc.
Then I proceeded to turn it back on, and see the damage.
I knew I couldn't have gotten lucky, and had no damage...

So, last night, none of the keys worked.
I tested it this morning, and some of the keys worked.
Actually, the majority of them worked. 'G','H','R','Y',and 'C' were the ones that I remember not working.
After school today, I took it to the local mac store so they could look at it.
I told them that some of the keys weren't working, and that I suspected it may be water damage.
I backed up my hard-drive just in case.
What do you think they'll charge me to fix it?
I know that Applecare doesn't cover H2O damage, which is a bummer.
I'm hoping it won't be a whole lot, seeing that most of the keys work... =/