You can see what DESE presented to superintendents the first week of July on foundation budget numbers here. This includes the actual dollar amounts for each category of student, and it also has the deciles of funding for economically disadvantaged.
UPDATE (thanks, Melissa!): If you want to find your district's decile, you can find it on the bottom of your districts foundation budget spreadsheet (which you can find if you download the complete spreadsheet for FY17 from here). Check out line 14: