The easiest answer is to know what to buy, the week they come out and buy them from your local comic book store at cover price. If you have multiple LCS’s within driving distance, scout them for how they price their comics. Regular covered comics should always be priced the
Comic cons and expos are very hit or miss, but you can typically find value regardless of where you attend. If you’ll be attending a con or expo that you’ve never attended before, do some scouting before committing your time to it. Check their website to see how many
Like with all investments, the objective is to buy low with potential to increase in value. What’s the best way to do that? Striking gold on Craigslist, garage sales, estate sales and storage unit auctions often make for great stories, but more times than not, you’ll walk away disappointed. Why?