$20 would be $20 - $30;
$50 would be $100 - $150;
$100 would be $60 - $100;
$500 would be $150 - $250.

I think they book for a bit less than that actually, but that is the range where I generally have seen them sell (but again, I'm no expert). In today's envioronment I would expect to see them on the lower end of that range, altough depending on condition you could get more. You also have lower serial numbers on some of them (i.e., less than 200, so in theory you could put a matched set together), so that could also bring a premium with some buyers.

I figure if I ever buy a $1,000 I will have to stop collecting, so it will forever remain a 'Holy Grail' of my collection .

Brent J. Jensen
orbis non sufficit