Dear WOAM,
You can buy a Sawzall reciprocating saw for $ 100.00 or so that will do the job and save it for later projects. The saw is versatile and durable.
Len

If you plan ahead and do all your measuring in advance, you can then go rent a pipe cutter (or other tool) for 1/2-day and not spend a fortune doing it. You can make your cuts and then return the tool to the rental place.

I'v had to do that alot a couple of months ago and i used a grinder with a cutting blade.Just remember to mark right around the pipe.It works great.

I had a steel fence post between two garages. There was only room to stand sideways. I used a dremel while balancing on one foot. Slightly acrobatic, but it did the job!!!