Well if they're still making it, they should distribute it. I recall reading that they had a contract for some military purchases until some future date. Maybe they just don't want to fool with it once that's up, but are selling some small amounts directly to people who ask for it.
It had become almost prohibitively expensive even before they stopped distributing it, though. The price of paper+chems needs to come in at no more than about twice to three times RA4 prices (in similarly small quantities) to make it very viable.