I was out antiquing today, and ran across two types of marbles that I haven't seen before.  I'm hoping that somebody here might be able to give me a basic idea of what I was looking at, and their value. 
1-  One lot had about two-dozen smallish black Benningtons.  These were very clearly Benningtons, and not painted clays.  They were also very clearly black; it wasn't a dark blue or a dark brown.  I've never seen any that are black before, but the lot was rather expensive (they were just a small part of a larger -and very nice- lot), and I'm not going to drop that sort of money before I know what I'm looking at.  Does anybody know just how rare these are, and if they're worth anything? 
2-  There was a larger marble I found that looked similar to a hybrid cat's eye, except for the very milky glass it was in (insert cataracts joke here).  I'm guessing that it was a little over an 1" diameter.  Are translucent-based cat's eyes a known phenomenon, and are they worth anything? 
3-  I've seen several Shoot-A-Loop toys before, but they're always in the $90-120 range.  I found one today, in good condition with it's original marbles for $30.  I didn't buy it, 'cause I'm not hugely interested in them, but I'm still kind of curious.  Does anybody know how much Shoot-A-Loops generally go for?  Is $30 a really good deal, or about average? 
Also, I haven't been on recently, and might go into hibernation again for a bit after I get these answers.  But...  hi to all of you!