There are quite a few that have been produced over time, creative
searching on google and eBay will reveal many.
Some very specific examples I've used that will work with m0n0wall:
* Znyx ZX346/ZX346Q (quad DEC/Intel "tulip" FE)
* Matrox NS-QNIC (quad Intel "fxp" FE)
* DLink DFE-570TX (quad DEC/Intel "tulip" FE)
Some eBay searches to get you started:
Mark Schoonover wrote:
> I need to purchase a multiport NIC, 4-port variety. Reading the hardware
> notes for 4.4R, I see only one multiport NIC, the ANA-62044 64-bit quad
> port 10/100baseTX adapter. Are there any others??
phil at brutsche dot us