This article is from the Amiga Networking FAQ, by Richard Norman with numerous contributions by others.
Arcnet runs at about 2.5 Mbits/sec which is a lot faster than parnet or Appletalk, but not as fast as ethernet. Arcnet hardware is cheaper than ethernet, however, so for a small shop they may be a better deal.
Once upon a time, CBM released the A2060 for the Amiga 2000, and the A560 for the A500. You can probably still find these used, and apparently there is a SANA II driver for them called ch2060.device by Carsten Heyl. Look on Aminet.
CSA was working on some, but are on hold pending the outcome of the CBM liquidation. Contact CSA if you are interested.
 
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