Try Radio Shack...they have a Monster version for about $99, then their own brand for about $12.99. Just make sure what you need is the DVI-I, and not regular DVI. DVI-I won't fit into regular DVI.

DVI (Digital Visual Interface) ports aren’t nearly as common as they once were, but they can still be found on older displays, GPUs, and A/V equipment. If you have an older device that does have a DVI ...