The only ones I see are sfp+ cards, those also require transceivers (at ~$50 per) to work. The cheapest 10gbase-t cards I can see are refurbished PCIe 16x cards with active cooling for ~$40, you probably don't want those either. Really, as a consumer you want either a PCIe x4 or ideally a PCIe 4.0x1 card, with a modern much more power-efficient chip.