Right now as I'm typing on this computer, I'm watching the Columbo episode, "How To Dial A Murder". I'm wearing pyjamas, which I suppose makes me a "casual" viewer. However, I'm also wearing my raincoat over the pyjamas, which I suppose makes me a "devoted" viewer. I guess I'm just casually devoted!
Fred, I'm afraid all the tapes I have are just ones which I have gradually collected by recording any episodes shown on TV. I do have all the original episodes except for 'A Deadly State Of Mind' and 'Ransom For A Dead Man' (which I desperately want to get!) and many of the '80s/'90s episodes. A tape to tape recording of them would probably be fairly poor, but certainly better than nothing. If you wanted I could probably manage something. Otherwise, if you live in the UK then you should be able to find the first three seasons on DVD. I'm not sure what is available in the US.