Picking up Just Cause 2 for 3.75.
Any of the DLC guns worth it? I mean I know they're only a quarter, but, I still will hate myself if they just sit in my inventory
Yes, you need the Air Propulsion Gun.
The one downside is that it needs to be purchased from the vendor/Black Market, which requires you to have a decent amount of cash, and to earn cash you have to 'grind' a bit by destroying shit. Because of this, you don't get to use the higher end weapons nearly as often as you should since ammo is very limited. The game desperately needed cheats or unlockable free weapons, but that can probably be fixed with a mod.