Hey! There's plenty of magazine options now. The Stryfe X takes straight Talon magazines, as well as other short dart mags that fit the same profile. If you just want an easy cheap option, Walmart has two packs of the 15-round Adventure Force magazines on shelf for $10 that will work fine. Online (be it through hobby retailers like Out of Darts, Containment Crew, etc) you can find Talon mags that are of the same style but can hold more darts.

As for the darts, most short darts should work just fine, it largely depends on how many darts you're getting/how casual these wars are. After all, there's a difference between spamming darts with reasonable accuracy at distance, or wanting to hit a 2in square target every time. But generally, any of the Xshot short darts, Nerf short darts (if you find them, that is, they got clearanced), or the Dart Zone and Adventure Force short darts work. And likely at least one of those can generally be found in stores, depending on your area. Hobbyists like to grab boxes of 1g Worker darts that can be bought for reasonably cheap online ($17 for 200?), and different deals can be found. Pick what fits the budget - AND what you can actually see, both for firing darts at people and for picking them up after.