Acid Drops

I have come across a period recipe for "Acid Drops".  These require tartaric acid, which the local grocery store does not carry.  Between looking for chocolate and other ingredients, I should start a business that specializes in premium and weird candy ingredients.  Anywho, my internet search says tartaric acid is available as a home brewing supply.  Now another decision: Do I just buy from the internet and hope the post office doesn't screw up or do I look around town for a home brewer.