With orders of $25 or more, Amazon offers Prime members the Nerf N-Strike Jolt Blaster in Blue for $3.99 with free shipping. (Non-members can spend $35 to bag free shipping.) That's $3 under what you'd expect to pay at a local store. It includes two elite darts.
Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.