> Rollei Retro 100 is still around in 120 ... supposedly Agfa APX100

Yes, it is made from APX 100 - 35 mm material. Medium format film has normally a thinner base, but this one has the thich 135Ám base of 35 mm film. The film is slightly shorter than other 120, but I get 12 images on it on all cameras I tried. APX Medium format film isn't produced anymore, I bought my last packages at least 3 years ago. It has an expiration date of end 2011, but works still fine, of course.