SATA Card, 4 Port SATA 3.0 Controller Expansion Card with 4 SATA Cable, 6Gbps PCIe SATA Card with Low Profile Bracket, Non-Raid, Boot as System Disk, Support 4 SATA 3.0 Devices
I’m mentioning this 4-port SATA expansion card as an option when you need a few extra SATA ports beyond what the motherboard provides. For light expansion it can be convenient, but for a TrueNAS/ZFS setup I still prefer a proper HBA when the build starts getting drive-heavy. The main takeaway is: plan your connectivity before you buy drives.
You'll be taken to Amazon to complete your purchase.