Check out http://www.cells.com.tw/en/products.php?m_sn=6 I haven't used CELLS TEC but I believe they make good spindles, both motorised and non motorised.
Stuff like http://www.aliexpress.com/store/prod...643490383.html might be worth looking at.

Are you more interested in built in motor spindles?

Cheers,

Fenza