With orders of $25 or more, Amazon offers Prime members the Nerf Rebelle Courage Crossbow Blaster, model no. B1694F07, for $5.71 with free shipping. (Non-members can spend $49 to bag free shipping.) That's $2 under our mention from January and the lowest total price we've seen. (It's $7 under what you'd expect to pay at a local store.) It features one-handed firing and comes with two whistling arrows.

Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.