[Arran]

I see that as well, there is a goof in my region trying to get $2900 out of a barber pole Predicta and you can clearly see that it has NOT been electrically restored, as is it's probably worth maybe $400 on a good day. He also has a Princess chalk full of his trademark hack repairs, he wants $1500 for that, probably not worth $250 as it sits, it may have been had he not messed with it. The Holiday and Princess models are the most common by far, but the Holiday sets have that crappy 110 degree short neck CRT with the 2.3 volt heater, many of the ones with good tubes have either replacements or rebuilds in them.
They are not exactly rare sets, sometimes the thing to do is just contact one of these guys, give it a look, and make an offer. Even as working about the only thing they have going for them is the unique design, they were never great sets as new.
Regards
Arran