All Electronics is selling surplus mica caps.  They have ratings of 
1200-2500 wkgv.  The capacitance ratings are: .0003, .002, .0035, .004, 
.005, .006, .02, .02 ufd.  The advertisment says they are excellent for 
high voltage projects.  Prices are $1.00 and $1.25 for two.  Is it 
possible to use these by connecting a bank together in parallel and 
series to obtain the correct voltage and capacitance?