Must be alternative to the unstable sodium sulfide + sulfur in water + methanol method.
Reasonably ‘stable’ aqueous solutions of sodium polysulfide (Na2Sx, x~2.3) can be obtained by reaction of aqueous solution of sodium hydroxide with sulphur at high temperature. Please note that stability of polysulfides is necessarily conditioned by its corrosiveness and high reactivity with many reagents.
Please check this reference for its possible interest:
H.J. Scheel, "Crystallization of sulfides from alkali polysulfide fluxes", Journal of Crystal Growth, Vols. 24-25, 1974, 669-673.
http://www.sciencedirect.com/science/article/pii/0022024874904023
Another reference that you may possibly find particularly useful is:
T. C. P. Lee, "Properties and Applications of Elastomeric Polysulfides", Rapra Review Report, Vol. 9, No. 10, Report Nº 106, Smithers Rapra Publishing, 1999.
http://info.smithersrapra.com/publishing/WRR106/properties-and-applications-of-elastomeric-polysulfides/
For a somewhat related question at this forum, dealing with calcium polysulfide (CaSx), please check:
https://www.researchgate.net/post/Is_it_possible_to_produce_poly_lime_sulfur_from_calcium_sulfate_what_will_be_the_conditions_of_reaction
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