You can find many brands that we support for NIC cards and switchs such as:
Chelsio Communications, Intel, Myricom, NetEffect, Neterion, NetXen, SMC Networks, ... and many more.

Please visit our website at:
http://www.open-e.com/service-and-su...tibility-list/

to find compatibility list ( if you have a brand/model that is not listed, please ask our support team to help you more about that ).

For the prices, you can check many websites that sell switch/NIC online or contact a reseller near you, or if some or our forum reader help with that