Increasingly difficult to find I've seen prices for this all over the place, from as little as £5 up to possibly £40, so if you get the chance to pick it up cheap, cease the opportunity. Its hard to judge realy, they turn up sporadically, and its hard to tell its frequency, it certainly would more than likely be one of the last few for your collection. Radiola & Siera, none of the forum members seem to have these versions, although it seems someone does...hence the below pictures. but I would think your going to have a fight on your hands if one of these turn up on eBay..and even more so if you see the Jopac version called Mith+Math To sum it up (no pun intended) this is a keeper in any format, pick up any copy you can. this thing will only increase in value as we realise just how rare it is, especially in non-Philips variants. Cardboard in good condition will be quite sought after.