Steve,
Yes, I've sent plants to Wilma before. She's involved in a very worthy cause and I've been more than happy to help support it. She's a very nice lady, too.
I have considered buying the neritina snails from her, but it was after the cold weather had set in and I decided against it at the time. They're pretty pricey, too, at about $5 each. Thing is, I really wanted them when I hatched a few hundred Amano shrimp larvae since I needed a cleaner that could tolerate brackish conditions. But that project ended miserably and I really haven't found a need for them. I suppose I could try them in my planted tanks to see if they'll scrape off the green spot algae.
I guess I'd never recommend those larger snails like mysteries for planted tanks. If they die, you may not find them until they're well on their way to rotting and fouling up the water. That's a lot of body mass to decay... When my little ramshorn snails die, my Amano shrimp usually feast on the carcass right away. Heck, I suspect that they have the occasional "live snack" when they're really hungry. Frank Greco says that if he tosses a handful of snails in his Amano shrimp holding tank, they all get eaten in a matter of hours. The snails, that is...
If you're still insistent on getting P. bridgesi, make sure to get them from a reliable source: Wilma's (if she's selling them), or maybe AquaBid, or I'm sure some of the on-line plant/fish retailers have them, like Aquatic Plant Depot or fishnet.com.
-Naomi