What are the average asking prices these days for a Hammarlund HQ-180 in
EXCELLENT condition?

I'm looking for the 180, 180A, 180C, or 180AC, but would consider any of
them except the "X" models (the ones that had the crystal switch)... no
particular reason except that I have absolutely no need for the crystal
switch and would rather have the clock (although I assume I could remove
the former and install the latter if I had to...).