r00kie has it correct. There are no mainstream cards that fit your criteria. Professional cards (Matrox, FirePro etc) are too expensive for your budget, and the few oddity X2 cards with 4DVI are now long discontinued (used market?).
Going the DisplayPort adaptor route might work if card+adaptor is within budget. Or if this is simply for 2D desktop, how about 2 ultra-low end cards, each with 2DVI (requires 2 expansion slots total)?