There is also LensVillage. I poked around about them and they seem to be in the same areas as pinky and have a lot of the same contacts. I had to go there for the pair I just bought because I'm -3.00 in each eye, and though pinky had that for my right eye, the options for my left were either -4.00 or -2.25, neither of which would work.
I do however agree with wanders_alone, you'll be fine if you stick to 0.25 within your script.
You may also want to talk to your eye doc and see if he's willing to even you out. I had a 0.25 difference between my eyes since I started wearing glasses, went to a different eye doc once, and he said that my eyes were so close together that he was just going to even me out (hence why I now have -3.00 and -3.00). I find it way more convenient because I don't have to buy 2 boxes of contacts now and I don't end up with that awkward single lens that managed to not get used.