Also check out the Nerf N-Strike Raven (Glow-In-The-Dark Darts) for $24.88 at Amazon: http://www.amazon.com/Nerf-34069-N-Strike-Rayven/dp/B0060Y240O/ref=pd_sim_t_3
The clips are actually what cause the darts/discs to glow in the dart (takes batteries), so can be used on any Nerf gun you have that takes either a dart-clip or a disc-clip.
These are normally $29.99 at Wal-Mart/Target + tax.
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