$12256 / $11500
These sounds are based on following two sound recordings:
http://freesound.org/people/eklee/sounds/158058/
http://freesound.org/people/eklee/sounds/158057/
Extracted for http://opengameart.org/forumtopic/key-press-sounds
Available as flac 48000 Hz and wav 44100 Hz.
I recommend Audacity (graphical) and SoX (command line) for audio conversion, editing and mixing.
Preview generated with https://github.com/qubodup/ogatools