Its hard to get examples and finding them is the challenge, finding them on a budget is the next challenge.
Try buying a LIP R27 these days with out selling your soul. LIP 148/184 isn't too bad.
Elgin 725s can go for lots, Elgin 722s, well you don't see them. normally if I go near something that has contacts and a battery, I got smashed by the snipes.
So the experienced guys here have a great collection and the newer guys are struggling to build a collection then finding people to work on them is the next challenge, if you can find the parts.
and really, what recent discoveries have been made to talk about ? its all pretty much known and documented, between Paul's website and crazyatches there not much unexplored territory.