A: As my mama once told me, there’s no such thing as a completely free iPod. But in this case, she may have been wrong.

Many of the sites in question—FreeiPods.com, FreePSPs.com, FreeDesktopPCs.com, FreeFlatScreens.com—come from one company, Gratis Network, which has earned a reputation as being fairly legit by actually giving away thousands of free items. So what’s the catch?