MikroTik

Low cost... that's obvious.

Does anyone know of any 4x SFP GigE cards that work well with RouterOS? I poked around, but they look to cost several times more than I'm spending on the server to put them in.

Im assuming this is for an x86 platform. If so, have you checked out Hot Lava? They had pretty decent priced expansion cards for x86 systems using RouterOS.

http://www.hotlavasystems.com/

Yes, for x86. The cheapest I've found so far is WinYao at $150 - $165 for Intel I350 and 82580.

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Not sure you will find anything less expensive other than used of eBay maybe.