Encore is ONLY bundled with Premiere Pro... when you buy and register PPro, Encore is also activated and ready for use
You may buy only PPro (with the Encore bundle) at http://www.adobe.com/products/catalog/cs6._sl_id-contentfilter_sl_cata log_sl_software_sl_creativesuite6.html?promoid=KFPMZ
I don't use the Cloud, but it MAY be that you may subscribe to only Premiere Pro Cloud Forum http://forums.adobe.com/community/creative_cloud