Peter brown the other day on the chicken whisperer show said the big poultry houses use the nitrogen cooled stuff, but the stuff sold to consumers/small farmers is the kind that comes in the wafer (that goes bad in an hour AFTER you mix it). So there's two types to get! 
http://www.firststatevetsupply.com/store/product_info.php?products_id=84

http://www.firststatevetsupply.com/store/product_info.php?products_id=84
We just had a Poultry event and the DVM from Cornell said that Marek's vaccine had to be stored in liquid nitrogen. Do you have something new?
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