>I'm not too sure on this, but Having a quick look at a price list reveals
>that zip discs cost about 70.50 for 6 (about 12 pounds each)[1] The time
>to copy them isn't much and posting is probably no more than for a CD so
>they possibly work out cheaper, and can be reused when they're finished
>with.  So at a rough estimate charging 20 pounds would cover time, copying
>checking and posting, the buyer gets a zip disc with riscbsd on and can
>reuse it when it becomes out of date, whereas it's about 25 pounds for a
>CD that can't be reused (although that has the advantage of being harder
>to damage/loose the data, and more people have CD-Rom drives...) 

You shouldn't pay more than a couple of quid for a Gold Disk - so as long
as you don't order them one at a time and pay postage on each it's a lot
cheaper to get a CD. Probably more hassle to burn a small number of CDs
though and you need to lay out more cost on a CD writer that you're less
likely to otherwise use (about 200 quid) - still being able to write audio
CDs is cool :->

Manar