Just noticed that Atlas has scheduled a new run of BLMA 70 and 100 Ton Roller Bearing and 70 Ton Friction Bearing Trucks with metal wheels for the third quarter of 2017. http://www.atlasrr.com/Trackmisc/trackeraser.htm
The the 100 ton RB is currently in stock at the Atlas store....I bought some a bit ago and in fact have just put them under some 5700 and 5800 covered hoppers.