I want to upgrade to X3 LE but I'm not sure if I can.
HEEEEEEEELP

X3 is not available anymore. Look into the Artist, Professional, Platinum versions.

AFAIK, SONAR X3LE is still bundled with some hardware. I have no idea if it is available for the asking.

This is the new lineup of products, and you can upgrade from your version.
http://www.cakewalk.com/Products/SONAR/Versions#start
All the best.

LE products are free with hardware and provide a way to get into a full Sonar product via an upgrade. You can't upgrade to another LE product.

See if this link helps this link will take you to the Sonor LE site.
Good Luck

LE is not worth using. Use it to upgrade.  I own LE and have tried to use it and you are better off with Sonar 6 even.

I recommend Music Creator 7 over any LE version.  MC7 costs around $20, and works much in the same way as Sonar.  You're "limited" to 32 audio tracks, 8 instrument and 128 midi tracks, but if you can't create a finished production with that, then you should probably find another hobby.  Unlike some other junior DAW versions, MC7 supports 3rd-party VST instruments and FX (including VST3).
 
Don't know where else you'd get a full-fledged DAW for under $20....