Depends on what kind of tool you want. If you\'re after the normal double-ended metal type, recent thread from the General Discussions forum:
http://www.coolminiornot.com/forums/viewthread.php?tid=28648
You\'re unlikely to find this sort of tool elsewhere as cheaply, in the UK.
You can make your own sculpting tools from shaped cocktail sticks, sanded smooth and coated with superglue - some sculptors do almost all their work with this kind of thing (plus a couple of needles, a craft knife or two). Also consider old brush handles, swizzle sticks and wooden dowels as potential sources of material for tool making.
Have a look at the selection of tools in my photos in this other thread on pF (page 2):
http://www.planetfigure.com/forums/showthread.php?t=18072
Einion