Reductive aminations in the biopharmaceutical industry are done using sodium triacetoxyborohydride due to lower level of toxicity. As Mishifus indicated, this reagent is cheap and very easy to make.
When reducing imines, NaCNBH3 requires pH 2-4 in order to work since the key step is protonation of the imine, making the species electrophilic enough for the hydride reagent. The reaction is typically performed in methanol solvent. Although some people use dry methanol, it's never used on an industrial scale.
Likewise, on a kilogram scale dry methanol is not used for sodium triacetoxyborohydride. Once you try this reagent, you may never go back to NaCNBH3 unless you absolutely need it. In methanol, there is enough acetic acid liberated from the reagent to produce a pH 3 solution, hence there is no need for addition of acid.