My aquarium snails are awesome, salt and freshwater…so many cool little cleaners. Wild caught snails can have parasites but as long as you wash your hands, don’t lick or kiss, and keep it out of your mouth you should be ok.

I haven’t ordered from here but it’s a good place to look at pet snails (terrestrial).
https://www.snailysnail.com/buy-live-pet-snails-online

I have ordered from this site; snails arrived alive and are thriving (marine and freshwater).
https://www.liveaquaria.com/

I just wish I could build an ocean thermal vent so I could have scaly-foot gastropods, the most metal of snails. Literally, they have metal scales.