You'll pay more at the local pipe shop, but it's worth the price as "membership" to keep these places going. Often, they have a good array of bulk blends for a little less than their tins, and many independents will share the sources which are often Peter Stokkebye, Lane, or Sutliff. Some of my favorites online are smokingpipes.com, iwanries.com, pipesandcigars.com (despite their recent glitches), and 4noggins. There are a few others who aren't sponsors here, I won't list, that have particular items I use. For pipe cleaners and some of my regular blends, I use my local independent pipe shop whenever possible.