Well I'm the last person to disagree that they're addictive, Steve. I've probably owned 25 over the years and still have around 10!
The bizarre thing is 15 years ago I thought they were too ugly to collect, like all buttstock air rifles! Then I fired one and was instantly hooked.
So I'm not sure the affliction has anything to do with shortage of supply. It just means it's harder for you to find them. The consolation is that US examples tend to be in excellent condition.