The last time I called Canon to ask about the touch-up paint the USA Rep told me that the paint is now classified as a "hazardous substance" and can't be shipped by normal means (USPS/UPS/FedEX, etc). The representative said that other Canon branches may not have the same restrictions, but she was unsure which (if any) would actually to sell a bottle to an end user.

Checking my email log, that conversation was in 2012. I don't know if anything's changed since then. I know that there are vendors that sell knock-off touch-up paints on eBay, but from what I've seen, it's the older L-lens white (it's a bit warmer in color).