From what I read, you seem pretty well prepared for your new guys!
As for stocking up all you really need is to make sure you have plenty of food, since corys are eating machines!
Quick random reminder, remember that corys don't have "scales" they are what you would call "plated." So be sure to never put salt in the tank, and most other medications unless it specificly says its safe for corys.
I am so excited for you, make sure you post pics when you get them!
Rest in Peace: <3
Mack <3 (peppered)