My HQ16 was gently used by a very wonderful lady who also taught me how to use my Singer Quantum 6000 for embroidery when we went to pick up the HQ16. I paid $3000 for it without the frame as I already had a Grace Pinnace frame.
It is a wonderful machine. I love it.
Look on the HQ 15 website and the Home Quilting Machine website for used machines.
Mary Alice