Things You'll Need
Instructions
Read Advance Previews, a catalog for the comic industry. It will tell you what products are coming out in the next 3 months.
Get to know your store clerk. The amount of comic-related merchandise is phenomenal; your clerk will have an idea of what valuable items are coming out before you do.
Buy items that have limited availability. A limited-edition print, a special edition of a regular monthly or a limited-run vinyl figure are all worth more, because production is restricted. The less available a popular item, the greater its resale value.