BRK&T is actually a pretty small operation, and they make knives for several different other names as well. When they make a particular model (like a Mini-Canadian), it can be awhile before they make another batch.
I've heard they're going to be doing a batch of Mini-Canadians before too long (a month or two?), so you will be able to get one eventually. If there is a particular handle material you want, contact one of the primary dealers, and they'll be sure you get it.
Hang in there! I have a sheep horn handled Mini-C on my belt right now, and it's one fine knife!
BTW, Foilist, as of Sunday night, the sites I listed above have a total of 6 Mini-Canadians, some for under $70. That's as cheap as you're gonna find a live one, unless you can find something on ebay. And you can be sure that when BRK&T makes them again, the price will be higher!