I found the best deal, with an Australian retailer for the BBS01 kit: emax-ebikes.com.au/store/p25/BAFANG_BBS01_Kit.html
In Aussie dollars for $865 (US$683) with the code THESPHERE, I am getting the 350W Bafang kit, with optimal programming, and a 13AH Dolphin battery pack and free shipping...