Here is a link to a boot.img extracted using the instructions found in this thread for a Production Model Korean Optimus 2x (SU-660) (this is not a demo phone, but an actual store-bought phone). Version info:
Model Number: LG-SU660
Android version: 2.2.1 (didn't upgrade for fear of losing root)
Kernel Version: 188.8.131.52
Build Number: FRG83.star.20110119
Software Version: LG-SU660-V10g Jan 19 2011
can anyone tell me if this boot.img is signed/encrypted/anything bad?