I am not sure but you can contact MaHyTec, they produce hydrogen tank:

http://www.mahytec.com/en/home.html

We used to make it in 10 g batches but it is difficult to scale up. Dow used to make large batches years ago but since then I haven't heard of any one making it large scale. Good luck!

Have you had any luck since you posted the question?

No unfortunately. Yes, low batches are also done here.. Thanks!

You can buy it in alfa-chemistry, the link is below.

http://www.alfa-chemistry.com/aluminium-hydride-cas-7784-21-6-item-293660.htm

Hi Marek Polanski,

Contact MilliporeSigma (Merck KGaA) for bulk order quotation here:

https://www.sigmaaldrich.com/site-level/special-forms/safc-quote-request.html?utm_source=researchgate&utm_medium=social&utm_campaign=sigmaaldrich-chemsynth