In general, there is two-tier considerations to pricing.
1. Quality and manufacturing cost.
2. How to take people for a ride.
I reside in NYC. You can go into Bloomingdale's, and get a dress shirt for $90.
You can go to Stern's and get the same shirt for $40, or you can go to the Lower East Side, and get it for $22.
The same applies to computer parts.
It makes a big difference on how informed you are.
Last week Tom?s hardware compared three NICs.
I used Pricewatch.com to find the best price.
3Com 3CR990-TX-97 - $80
3Com 3C905C-TX $30
SMC 1211TX $13
Quote from:
http://www6.tomshardware.com/network/01q3/010820/nic-11.html#conclusion
?Well, there is some difference between Network cards. The difference was not that great. Some cards did have better performance than others, but over all most of the cards performed within acceptable ranges. ?
If you read the rest, you can infer that if there a difference it will impact high volume cooperate Network, and not three computers sharing the Internet at home.
Another comparison you can find here:
Network Card Roundup - Which is the Best PCI Network Card?
I wonder how many people spend over $50 for a NIC, can not afford a Router, and share with ICS.