
Welcome to the community Zaro.

I looked at a number of the packaged stamp inventory products and personally found them expensive and cumbersome. I put together an inventory system using Excel spreadsheets. I can print out inventories, want lists, collection values, etc. The same thing can be done with a database like Access, but it is generally a little more difficult. It takes a moderate level of experience to build fully functional spreadsheets or databases, but it doesn't take any skill that can't be learned in a week or two by someone who is computer literate.
Good Luck!