Installation cost me ten minutes of my time and a few minutes driving to my father's house to borrow his soldering gun. Oh, yeah, I had to buy an O-Ring at the hardware store down the street. It cost 30 cents.
So, converting one camera cost me 85 cents and a little time. Even if I'd had to buy a solder gun it would have been cheaper than paying $40 for the CRIS adapter. I still have enough diodes to convert 9 more cameras!