The easiest way to recycle anything is through reuse. So if you don't need them, you could give them to somebody who does. Just keep in mind that somebody who needs an SCSI scanner or phone modem can't likely afford to pay a lot for them. Perhaps you could try to sell them at a nominal price to cover shipping.

Something people often disregard when thinking about recycling is that a things value is not determined entirely by what it is made out of - but also the time, expense, and technique that went into its original manufacture. As well as what work can be done with it contemporaneously. Your average person wouldn't pay much for a handful of oil and sand, although that's basically what a computer or peripheral is. Even the crappiest old appliance is worth more than the elements it was made from.