Hi Andrea,

I'm at work right now and can't check, but I believe the premium styles are $6.95 each and the regular styles are $4.95 each.
The premium styles are well worth the money and as good or better than the internal T2 styles.
A couple of them have a really nice tight groove.
Some of the regular styles are T1 styles and some are new to me, but not as good as the premium styles.

Good luck with your USB LAN adapter.

Ciao

Eric