The "Parters" that sell individual parts from a kit, and they list them all in a row.
On average they ask $4.95 a part, and a kit will have 70 to a 120 parts. That's about $350 to $600 a kit (if they sell all the parts, which I doubt). I bet they have a lot of incomplete kits sitting around.
I find them very "not fun" when I am surfing the bay for a kit.