HiMedia sells hydrazine sulfate at a good price (reasonably good at least) in addition to a lot of other useful chemicals.
https://www.amazon.com/HiMedia-GRM2847-100G-Hydrazine-Sulpha...
They also have a website which you can apparently order from directly but I have not tried. I guess the selection might be a bit better there but
Amazon is probably easier.
https://www.himediastore.com/hydrazine-sulphate-a-r-100g
For you, since you are focused on energetics, some of their products are probably not useful, but for those who like biochemistry and organic
chemistry they offer a variety of agars and nutrient broths as well as useful organic chemicals like ammonium formate (good for Leuckart reactions),
tetrabutylammonium bromide, benzil. At least on Amazon their sodium borohydride and lithium aluminum hydride do not seem to be available, although
they are available on the website, the website indicates that NaBH4 and LiAlH4 are currently unavailable or out of stock, although they can be
backordered. Anyway, they have hydrazine at a pretty good price.
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