Lenovo Type 4337 Docking Station USB 3.0 for ThinkPad L420 L520 Laptop 615867780004 | eBay
Lenovo ThinkPad L512 L520 L530 Docking Station USB 2.0 Inc 90W PSU + Keys | eBay
Lenovo ThinkPad Port Replicator Series 3 with USB 3.0 - Port replicator - for ThinkPad L420; L430; L520; L530; T400s; T410; T410i; T410s; T410si; T420; T420i; T420s; T420si; T430; T430i; T430s; T430si at TigerDirect.com
Amazon.com: Lenovo ThinkPad USB 3.0 Pro Dock MFG P/N 40A70045US 45W (Renewed) : Electronics