Where to buy the tiny Polystyrene ball (blown) insulation

[ShaneCook]

I'd like to fill a cavity with that blown in insulation, the small Polystyrene ball type. I have access to the top of the cavity so I can just tip in the insulation until it fills up the space. The space is sealed, so the balls will not blow out. However, I can't seem to find anywhere that sells the insulation. Anyone suggest somewhere?

Kind Regards,
Shane Cook.

[TheDoctor5]

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