I've become a regular client of BW Bits over the last few months and have found it to be an invaluable source of individual parts.
Communication is excellent and you can always expect a prompt reply to your enquiries.
Parts come straight off the sprue so if you are after a specific marine head or an Eldar weapon then this is the place to shop.
I highly recommend them for all your individual parts needs.

LINK: Battlewagon Bits