Is there anywhere that lists trades/HCs that are going, or just went, out of print?

This thread from the Marvel Masterworks board is somewhat useful

http://marvelmasterworksfansite.yuku...1#.U-IevWt5mK0

Doesn't seem to have been updated since early 2013.

People are updating with new posts. The most most recent is from June 21.

I see that now. Cool, thanks. This will be handy. I wish the OP would keep a master list going.

That's a pretty tall task for all trades/HCs in general. And OOP doesn't mean rare or expensive most of the time. The Marvel Omnibus thread on CBR keeps track of the print statuses of Omnibuses, which often do get rare and expensive once they're OOP since they're for a niche audience.