I got mine from the same place (i.e. Atkins welder). In my search for 5”-6” inconel tubing I discovered several sources for it – but they all wanted a 10ft minimum order and at $110/ft that was a little more that I was willing to invest.  It talked to Atkins about my dilemma and he said he had faced the same thing and had bought a 10ft length of which there was 5-6 feet left. So I got 12” of it.

He may have another foot or so left.