A recent remote data sensing project required buried Power Over Ethernet (POE) network data lines. Direct burial cable was sourced from TrueCable. They have good selection of network cable with extensive stock and free delivery. Very pleased with the quality of cable received and recommend them.
No matter what brand of data cable you choose for a project just make sure it is solid copper wire. There are a number of low cost Copper Clad Aluminum (CCA) suppliers and CCA cable is less expensive. But CCA cable is not certified for POE use, or any Ethernet data use.