Sprayfoam Insulation - Where to buy on line

[George P.]

I have two exterior walls that need insulation. one particular wall has just the studs and the bricks behind them, so no way of putting sheeting/tar paper/vapor barrier, etc.

so, i am thinking of just putting sprayfoam.

is there a place online where i can buy supplies so that my contractor can do it? 

I can't tear the bricks out, just to put sheeting and vapor barrier. i want to accomplish both with the spray foam

here are pics.

any suggestions?