Those Shreve drives were $10 + shipping the last time I checked. I suspect that the low price on the auto-inject is simply because they are for older Macs and the demand is lower and slower.

Shipping is $7 per drive regardless of how many drives you buy. You'd think you'd get some break in shipping cost with quantity. Ah well. $10 shipped is a pretty good price.

I've never been a fan of Shreve, but they have been around for a very very long time in computer years.