Theoretically, any acid that will readily donate a proton to the amine group, to form the ammonium ion, will crystallize when removed from solvation.
Things to think about:
Acetate
Nitrate
Hydrobromide
Hydroiodide
Lactate
g-Hydroxybutyrate
a-Lipoate
Ascorbate
Tartrate
Citrate
PrimoPyro
Vivent Longtemps la Ruche!