Yikes. VGA to DVI-D is expensive, it seems. Some products I've found about while scouring the internet have allowed me to come across these items:
5 30 5 Pin DVI D to VGA DB15 USB LCD CRT PC Cable 1 8M | eBay
I know that converting the Analog VGA to the Digital DVI-D can be troublesome, but this cord appears to do what I need it to do... right? I mean, what does that USB portion do, exactly?
I know I could get a straight-up video card, external or internal, but I'd rather not spend that kind of money if I don't have to.