The DD #2 is a $20 book.
That's what I sold it for a few weeks ago at least.
Guardians #24 is about a $10 book. However, it'd be best to wait until the movie is about to be released or Thanos makes some more waves.
I believe it features a cameo at the end and then a full appearance in #25. Those books acted as a reintroduction of Thanos into the 616 universe if I remember correctly.
Am I going to learn karate?
The Dane Cook of martial arts? No.