Shiurim of HaGaon Rav Avraham Yitzchak Bloch זצ"ל הי"ד vol. 3-4.
Incredible. You can take part in shiurim he gave in Telz between the two World Wars.
Binyan Ephraim.
Chiddushim of HaGaon Rav Ephraim Bordiansky ztz"l on Shas. [30 shekel!! CRRRRAAZZZYYYY!!! A gold mine virtually free].
One of the biggest lamdanim in Eretz Yisrael in the previous century, a Talmid of R' Shimon!! See also here.
