High voltage resistors


Does anyone know of a source of new high voltage (30+ KV) , 125 Mohm
resistors or any high voltage any Mohm resistors in general.  I will
only need about 4 for my purposes.  I'm building a voltmeter to measure
the output of my pig.  I know I could use a neon transformer or similar
but would rather not have the bulk of a transformer.  Also,  my maximum
voltage would be more limited with a transformer

-- Dave Euans