Perhaps there should be an "other" category. I tend to make most of my kit and aftermarket purchases at model shows and contests.
Any others?

Most of my purchases are the same too,I frequent a quarterly trade show out here in California,model kit expo (aka Keller show) great place to pick up old, new kits and accs.
etc. The rest are usually from friends and fellow modellers stationed around the world
such as Korea and Japan where it's cheaper most of the time to buy it there and ship it than to buy it here.