In an actual experiment we would like to measure the static pressure in a cryostat in the range between one and four bar. Therefore we are looking for some (more or less) cheap pressure sensors that work in liquid helium in the pressure range up to five bar. Unfortunately all sensors mentioned in the literature (PD116 from Toyoda, KPY series from Siemens, FPS51 B from Fujikura) are no longer available. Does anybody know a supplier of a pressure sensor that is proven to work down to 4.2 K? Any hint is highly appreciated.