I found some nerites!
I have been looking all over and finally found some nerites at Petsmart. I wish I had found them at a better store, but none of the smaller independent shops had them.
I bought 5 total, 3 zebras, and 2 tigers. They are mostly very small, one I would consider medium. I put 2 of them in my 2.6 betta gallon tank, and 3 in my 4 gallon betta tank. If all goes well and healthy, I plan to move some of them into my other 2 tanks in a few weeks. I put some plastic over the holes, so they should not escape.
My tanks are cycled, and I do 2 50% water changes each week. The additional bioload from the nerites won't require more water changes, will it?
75 g. planted peaceful community of denison barbs, cories, neons, boesemani and turquoise rainbowfish, pearl gourami, ancistrus
35 g. long semi-aggressive community of mature m. lacustris, diamond tetras, golden gourami
36 g. bow with pagai praecox and kamaka rainbowfish.
3 pico planted tanks with bettas and nerites.