Yeah I've been wanting some MTS's for a while, but here in the unfashionable outer spiral arm of Podunkville, we don't have a decent LFS with MTS available. I'm tempted to use the Red Ramshorns that have invaded a local sand lake, although I really shouldn't because wild gastropods are vectors for all sorts of nasties you don't want in with your fish and plants.
Hey I can just toss some babies in a 1st class envelope for ya (free!), just pm me your address. If they don't make it then I guess you can pay for shipping and I'll send a second attempt with the shipping of your choosing.
The variety I got from my LFS are not pretty, but they're functional to me. Also I got em free... just asked for some at my LFS and he grabbed like 8 or so, now I have so many... fortunately they tend to stay low. Now bladder snails... they get on the glass, so annoying.