Started with Excel, but I transferred the data to Google docs. I don't keep inventory. Instead, I just record when I get the cigars. I usually buy by the bundle or box now so it's not too difficult to keep track. For Opus and Anejos that I buy couple per year, I put dated sticker on them. They're basically blank stickers you buy at Office Depot or somewhere and I just ink the dates on them. Very easy to keep track that way!