With orders of $25 or more, Amazon offers Prime members the Kids Station Musical Band Drumset Music Set for $6.49 with free shipping. (Non-members can spend $49 to bag free shipping.) That's about $8 under what you'd expect to pay at a local store. It features a drum, sticks, two castanets, tambourine, maracas, and whistle.

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