Be a dwarf! Or a halforc!
Darkvision spell too. Hours per level means that it lasts forever. It's level 2 so a potion isn't too expensive.
I think barbarians can get darkvision when raging, so at level 2..
Blind Oracle gets better things, and the curse grows with character level.
But if you ask yourself "If there was a feat that granted darkvision, would I take it? " and the answer is yes, then play a dwarf! You would get a snazy +2 to saves vs spells, poison, and diseases thrown in for free as well.
or you can get glasses/whatever that give 3 hours of dark vision once a day for only 2160GP. Yes potions would be pretty cheap at first (only 300gp) but would be more expensive in the long run
Shadowdancers get Darkvision at Lv 2.
Goggles of Night grant 60 ft darkvision for 12,000 gp.
3rd level horizon walker gets darkvision 60 at 3rd level with the underground favored terrain.