Making a loom for spool knitting is easy and fast. Plus, given that a homemade spool knitting loom can work just as well as a commercially available one, there is no reason you should not make your own.
First, cut the big sides off all five paper clips; save these and discard the small ends. Take one of these U's and tape it to one end of the pipe so that the rounded part of the U protrudes between 1/4 and 3/8 inch above the top of the tube. Then, tape the remaining four U's to the same end of the tube attempting to space them as evenly as possible.