I have a simple note on my phone that I have all the contents of my humidor, or those that used to occupy it, along with how many of each I have. Next to the marca, I simply put a mark as follows:
++Very Good Buy More
+ Good, Buy More If Good Price
= Good, But Price Not Worth It
- Not Good

This way I know what I have and how many, and what I should buy more of or what I should avoid.