Of the sets currently available-

Here's a summary of the LEGO news article, covering all the important details:

The original poster on Reddit, /u/Altruistic-Bet5909, is looking for LEGO set recommendations under $100. They are open to suggestions for any theme and are considering the Iron Man Mech vs. Ultron set or the Iron Patriot set for army-building purposes.

The post is a request for recommendations, so there are no specific set details or prices mentioned. The user is looking for suggestions from the LEGO community on what sets to purchase within a specific budget. They have already considered sets related to Iron Man, indicating a preference for the Marvel theme.

Since the post is a request for recommendations, the best course of action is to explore the LEGO sets available. For those interested in the Marvel theme, the user could consider sets like the Iron Man Mech vs. Ultron set or the Iron Patriot set, as suggested by the original poster. For those looking to organize their collection, a LEGO storage organizer might be a good idea.