I agree with Bono’s estimate above for electrolysis.
Based on prices in my area, a full treatment schedule of laser for this area would be around half the cost of electrolysis. You’d need at least a 50% reduction to make it worthwhile. The other thing to consider is that doing laser and then electrolysis consecutively would mean some two to three years of treatment versus the 12 to 18 months if you just did electrolysis.
If you’re getting other areas laser (the chest, for example), then you may as well do the shoulder area there too. If not, go with electrolysis.