a place to start in obtaining nixie tubes is ebay. they are shipped out directly from Ukraine or mother russia warehouse. though these arent manufactured anymore they are mostly old stocks from way back in the 1970s. good ol russian tech. anyways the sudden gain popularity of nixie clock/projects causes a high demand which may caused in increased price these are the types available. small ones may cost from 2bux, lage ones 50bux (usd) each.