Is there a cheaper way to fix a few unresponsive keys?

I spilt a bit of beer on the keyboard of my MacBook Pro 13" Unibody Late 2011 last week and ever since then the R, 4 and F4 keys have been unresponsive. I never realized how annoying it would be to have only a few keys unavailable until now since I have to copy and paste the R and 4 so often...

I need to have this problem fixed so I was wondering what has to be done and how much it would cost to fix it at the apple store?

If it's pricy should I attempt the surgery myself or should I take it to some local computer tech who would be less likely to mess something up?

Thanks for you time,

Nick