Where to get Potassium Nitrate or Saltpeter

Alright so, I need the potassium nitrate for a little smoke bomb I'm planning to make. Also do I need to have special requirements to buy these?

Thanks.

Comments

Potassium nitrate are not allowed to buy here in qatar. You have to ask a permission from the police department or to the civil defense...
What the hell... How about saltpeter? Its a gardening item, is there any store that sells this?
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