For those in the Chicago area, I can confirm that the Asahiya Bookstore (847-228-9851) in the Mitsuwa Market has Pilot Hi-Tec C pens in 0.3, 0.4 and 0.5 sizes for about $2.80 each. Also, they apparently have the Kaimei brush pen that el coro (Justin) uses for his amazing sketchbook, but I didn't find this info out until I was buying a Kurakate brush pen at Dick Blick and the clerk mentioned it.
If I ventured in the slipstream between the viaducts of your dreams
Where immobile steel rims crack and the ditch in the back roads stop
Could you find me? - Van Morrison, "Astral Weeks"