Walmart offers the Philips Rock-n-Roll Speaker Dock for Apple iPhone / iPod in Black, model no. SBD7000/37, for $39. Shipping adds $1.97, or opt for free Site-to-Store. Even with shipping, that’s the lowest total price we could find by $11. Sales tax is added where applicable. This 4-watt speaker dock features a single neodymium driver, rotating iPhone / iPod dock, and more.