Detroyer.io is a service that destroys your hard drive. You place an order and a pre-labelled box is sent your way. When the box arrives, place your hard drive inside and drop it in a UPS dropbox.
Destroyer.io will demagnetize, shred, disintegrate, and then recycled the hard drive. This is the same methods used by banks and recommended by the NSA.
The first drive is $19 and $10 each drive thereafter. Try out Destroyer.io HERE