The keyboard is often user replaceable. It's under 100 bucks but if you can't bring yourself to do the work, figure about 220 to 250 at the shop counter to get the work done.
We have some tips on keyboard removal over in the top posts at the CNET Laptop Troubleshooting forum at
I just tripped & my ranch dressing flew through the landing right on my keyboard.
Brand new Acer 5750. Dressing has dried. Took off some keys. No idea what to do. Please help me