Top 5: Punisher
AMAZING SPIDER-MAN #129
AMAZING SPIDER-MAN #135
GIANT-SIZE SPIDER-MAN #4
MARVEL PREVIEW #2
PUNISHER (2000) #1 (White Variant)
MARVEL KNIGHTS PUNISHER OMNIBUS BY GARTH ENNIS
Sold out hardcover
This easily sells in the $300-$400 range every day, which might not sound like a big return investment (original price was $100), but considering Marvel reprinted the Alias Omnibus when the Netflix series was announced, this one will probably follow soon.
EMINEM / PUNISHER (XXL MAGAZINE GIVEAWAY)
The Punisher's 2nd weirdest crossover
With the hip hop Marvel coming up, you might want to get your hands on one of these as even if it's already rare, I would think it's about to get a lot rarer. A fun little story where Eminem and the Punisher fight each other and then Barracuda (in classic team-up fashion), this giveaway might be extra tough to find in good grade. There was a sale for $199 on eBay, and this has potential to do better.