I would just wear a blue one in one eye and a golden one in the other. The thing with contacts is that they are not THAT THAT THAT visible (unless you have a very flash colour or the person looking is up to your face). So nobody is going to be like: "Omg! That gold is slightly off!" No. And don't try piling two contacts into your eye at once either. I hear some people do that. Just no.
So yeah, like Ani said, some (most?) companies do let you buy contacts separately. For me, I kind of have to because my eyes are on two different prescription.
Buying two different contacts is what I did for Piko (who has one green and one blue eye). Just make sure they are from the same company, though, or at least have the same diameter (normal lenses are around 14mm and circle lenses are around 14.5mm.) A difference in size can make your eyes seem... awkward (one eye would look smaller than the other, kinda).