A few IMC confusers appear on ebay from time to time. I see there's been a few up for grabs in the last few weeks so you should have a look there, though one seller was having a joke at his starting price.
Not sure you are going to see any more new ones. If you trawl through the pprune archives, some prunes were saying that the author died a couple of years ago. Shame, a full IR confuser would have been nice.
There's still nothing better to consolidate your knowledge IMHO. Make sure you learn it all and then use the confusers to sharpen yourself up in preparation for the exam. The other obvious thing to do is to have a good hard look at the syllabus in Lasors. You'd be surprised how many people in all types of exams don't bother to check what they are going to be examined on.