If you are looking for alternative miniatures to use in your Warmaster armies, check out the following manufacturers:
Pendraken:
Decently priced 10mm fantasy and historical miniatures, with a pretty good range
of armies.
http://www.p-o-p.demon.co.uk/shop/pendrake/pendraken.htm
Chariot Miniatures:
A good selection of 15mm fantasy and historical miniatures (mostly historicals),
but only historicals in 10mm.
http://www.kbnet.co.uk/chariot/
Warrior Miniatures:
A small range of fantasy and historical figures (including halflings!)
http://www.warrioronline.demon.co.uk/10mm/index.htm
Iregular Miniatures:
Historical miniatures only
http://www.wargames.co.uk/Irregular/Irregular.html
15mm Historical Figures:
Old Glory:
15mm historical miniatures, good quality
http://www.erinet.com/bp/oldglor.html
Essex Miniatures:
15mm historical miniaturs with good quality, also some 15mm terrain (usable in
Warmaster)
http://www1c.btwebworld.com/essexminiatures/
Regal Miniatures:
15mm historical miniatures
http://www.regalminiatures.com/