where to purchase liquid nitrogen

{"cid":"91201138","title":"Ultra Low Chest Liquid Nitrogen Tunnel Freezer SUS304 2000KG\/H 2500KG\/H","imgUrl":"https:\/\/img.ismap.com\/nimg\/de\/89\/79ba2e1bb49e1ce46daf1d4191f8-200x200-1.jpg","attrs":{"Price":"negotiable","Brand Name":"DJL","Model Number":"DJL-QFL-1209A","Minimum Order Quantity":"1 SET","Delivery Time":"30-45 working days","Place of Origin":"Guangdong, China","Certification":"ISO9001","Packaging Details":"sea shippment package","Supply Ability":"10 Set\/Sets per Year","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Core Components":"PLC, Engine, Motor","Type":"Tunnel Freezer","Material":"stainleess steel 304","Working temperature":"-120\u2103---Room temperature","Cooling rate":"Greater than or equal to 20\u2103\/min","Heating rate":"Greater than or equal to 5\u2103\/min"}}

{"cid":"91198204","title":"PN25 SS Ball Valve , Flange Type Liquid Nitrogen Ball Valve","imgUrl":"https:\/\/img.ismap.com\/nimg\/79\/5f\/7e9b38acd96c416f1dca7f911501-200x200-1.jpg","attrs":{"Price":"USD268 per pc","Brand Name":"OEM","Model Number":"OEM","Minimum Order Quantity":"1 pcs","Delivery Time":"5-8 work days","Certification":"CE\/ISO","Place of Origin":"China","Payment Terms":"T\/T","Supply Ability":"3000pcs per month","Packaging Details":"Inner package:plastic bag sealed package Outer package:carton package or wooden case package The lettering, nameplate, certificate for valves are available","Power":"Manual","Material":"stainless steel","Valve type":"Cryogenic Ball Valve","Service":"OEM","Media":"LO2,LN2,LAr,LNG,etc","Connection":"Flange"}}