Amazon discounts a selection of boys' clothing sets, with prices starting at $3.53. Plus, most qualify for free shipping for Prime members. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping starts around $5.) Shop for clothes featuring characters like Mickey Mouse, Spider-Man, and the Paw Patrol.

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Note: Select styles are offered through Amazon's "Add-on program" and can only be purchased with an order of $25 or more.