The Russians sell them by the bucket on ebay: http://www.ebay.com.au/itm/TESTED-SBM-20-GEIGER-MULLER-TUBE-COUNTER-STS-5-NOS-SBM20-20-/121971429216?hash=item1c6

The Russians sell them by the bucket on ebay: http://www.ebay.com.au/itm/TESTED-SBM-20-GEIGER-MULLER-TUBE-COUNTER-STS-5-NOS-SBM20-20-/121971429216?hash=item1c66104f60:g:n~0AAOSw9N1VkV7W http://www.ebay.com.au/itm/TESTED-SBM-20-GEIGER-MULLER-TUBE-...