one of our newest members here, carol novicki, stated that she got a copy in a bookstore a while back for around $5!! now that is amazing. but it kind of gives you hope that there might be an obscure store out there that has a copy for a reasonable price. good luck!
Whenever I wander into a used bookshop I always make sure to check and see if there are any copies of "The Columbo Phile" which I could then sell on to one of my Columbo-cohorts. I've never happened across any.
Of course I already have my own copy. I remember purchasing it, brand new, all those years ago. I also remember that my copy was one of four on the shelf. If only I had forseen... Oh well.