Just plain colors? That's easy enough. Talk to the optometrist while you're getting your eyes measured. They sell lots of brands. In fact, you may be able to get a free trial pair
of some brands.
If none of those colors are just right, you might take your prescription to CosplayLab
.Not sure if they'll carry the exact color you're looking for. If nobody else seems to have exactly what you're looking for, the default answer is 9mmsfx
. You'll still need a contact lens prescription, but they can do custom lenses. This is also the only choice for people with astigmatism.