/diy/ - Do It Yourself

Why do water-based stains seem so elusive?
I'm going to start making picture frames - my first DIY outing - due to both rectreational interest and necessity. I've just been having a bitch of a time finding some sizes for prints I've owned for years, stowed away. I was thinking of using water-based stains since they're more convenient. I rent a lower duplex, so I don't really have a designated workspace; I'll just be using my part of the driveway since I don't park my car there. Not having to deal with the smell, clean up, or drying times of oil, especially in the cold Wisconsin winter seems great, but my local hardware stores seem to not even carry the stuff, barring some tintable base I would have to buy online and then take in to get mixed.

Anybody know of a good source for water-based stain with a selection of color in the Midwest?