We have...
Character & Campaign Law
Spell Law
Arms & Claw Law
Rolemaster Companions 1, 2 and 3.
Creatures & Treasures
Cloudlords of Tanara
...and that's it.
Anything else we should buy? I've played a lot of Rolemaster, but I never ran it, and it was over a decade ago. If there are any other books (or modules) you might strongly recommend, I can take to EBay, Amazon, Half Price Books, etc. and find them.