[Aka]

A lot of cases come with those built into the case. The last 3-4 I bought had them there.

The hard part is wiring it up cuz half the time they don't come with a standard plug, just a bunch of individual wires with ends on them labelled, but not labelled the same way as the motherboard.

Edit: Also, there's usually a FP_AUDIO somewhere on the motherboard, Front Panel Audio. If there's onboard audio on the motherboard, this is probably there too.