Generally, the "best" place to buy any parts is either Jameco, Digikey, or Mouser. These are all international distributors of a wide variety of electronics parts. They all have websites where you can browse their catalogs and order online. Their prices are reasonable given that most hobby orders are small quantities and involve a lot of handling. Their service is generally good and prompt. I've dealt with all three and think highly of them.
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Who says you have to have knowledge to use it?
I've killed a fly with my bare mind.