I've quite loads of Criterion Laserdiscs but unfortunately I haven't got a working Laserdisc player. I'd be happy to help in any way I can.
Off the top of my head, I think the following would be worth doing:
The Magnificent Ambersons Criterion
King Kong Criterion
Wyatt Earp Special Expanded Edition 4 discs (it's not a not commentary as such, but it's an extended version)
The Return of Martin Guerre Criterion 2 discs
Photographing Fairies 1 disc (never released on DVD)