I got it of the buy china web site, just had a quick look and its now on aliexpress web site.
If I were you I would get the shell and fit rc4wd hydraulics and radio gear.
It is lightly built compared to the rc4wd excavator.
I would also cost it all up and do a compare to buying the rc4wd excavator , I know its not as nice to look at but its a turn key and dig machine that will last longer than the KAT excavator.
heres a link to aliexpress
http://www.aliexpress.com/store/prod...944515294.html
cheers andy