1/4" wheel spacer source?

[Wes Shew <schumi@vcn.bc.ca>]

I'm looking for sources of 1/4" thick wheel spacers.
Anyone know of good quality, light, affordable ones? 
Is aluminum the way to go?
Cost?
If it matters, it's a 5 bolt Porsche 944.

--
Yours in motorsport, Wesley E. Shew   [ macher ;-) ]
#99 AS 1991 PORSCHE 944 S2 cpe 3.0L(M030&LSD)Indischrot/Schwarz Kunstleder
 #53 DSP 1980 VW Scirocco Mk.I, 1.6L bal.& blueprt, Platinum Grey Metallic
  SCCA (NWR) & PCA (CWR) Vancouver, Canada  (604)737-7649 schumi@vcn.bc.ca