eBay

Requires one empty slots between a two slot 2080 TI/Titan RTX.
Spacing between the NVLink ports must 2.36 inches / 60 MM / 3 PCI slots and both cards must be the same model.
Please let me know if you need assistance in determine if this will work with your motherboard.
Compatible with GeForce RTX 2080/2080Ti/2000 series cards with NVLink including the Titan RTX
3 Slot Spacing
Compatible with EVGA, Gigabyte, MSI, Zotac, NVIDIA, and PNY 2000 series video cards
Bare circuit board without the typical outer casing. Does not impact the functionality of the NVLink
Does NOT work with 3090 graphics cards.

RTX NV Link SLI Bridge, 3-Slot Spacing

This NVLink Bridge connects two NVLink SLI-ready graphics cards with 50x the transfer bandwidth of previous technology. This means you can count on super-smooth gameplay at maximum resolutions with the ultimate visual fidelity in GeForce RTX 2080 Ti, 2080, and Titan RTX graphics cards.