AfroCare.co.uk Afrocare specialize in synthetic hair that can be used for human
braids and weaves. I find they have a good range of natural colours at
Retro Dolls Another UK based site. Retro Dolls sell Kaiser stands that
are perfect for showing off your OOAK dolls and now they do Saran doll hair
which comes in a variety of colours. Added bonus of being in the UK so the
hair gets to you quicker.
Restore Doll.com A huge range of Katsilk Saran doll hair in amazing colours, this
US site will even combine two or three colours for you for no extra
charge. They are in the US though, which means it will take longer to get
to you but their postage rates are very reasonable - one of my faves!