A used ART DPS or DPS II should be easy to find sub-$200. You might be able to find a Digital MPA (better unit) for about that much if you're lucky.
Other than that, I don't think there's much for 2-channel pres under $200 with digital outs, unfortunately.
Of course, you could split it up and maybe have better luck that way. I saw an ART DI/O (A/D-D/A converter) go for $25 on eBay a few days ago. See if you can find a good deal on one, and then you could be open to more cheap/used 2-channel pre/DI options with the rest of your cash (tons of cheap ART stuff, M-Audio DMP3 or Audio Buddy, Symetrix 202, Aphex 107, etc.)...