You can get the Mini X and the MK802 from Miniand, and they actively support the hacking community and release Linux images for the devices:

Ubuntu 12.04: https://www.miniand.com/forums/forums/2/topics/1

XBMC: https://www.miniand.com/forums/forums/1/topics/136

MK802: https://www.miniand.com/products/MK802%20Android%20Mini%20PC

Mini X: https://www.miniand.com/products/Mini%C2%A0X%20TV%20Box%20H2...