I've watched people make hand made glass stuff it's interesting.. if you could do glass art you could very well make any thing or shape you want using gravity to shape the glass.
not sure if glass sex toys are automated or if they are hand made. but I'm guessing if it's hand made it might be over 100 dollars, which some of them are quite expensive hence the reason I brought up glass crafting..
If I was to craft anything I think it would be glass.. I mean you could make any thing you wanted in terms of shape, texture and size. I'm sure the local ladies would love to stop buy and order a hand made glass dildo and watch it be made/shaped right in front of them! It could be a way to get extra money for glass craft. I'm sure it could take off quite well in your town and you would be super popular with the ladies!
I'm not sure what type of special place you would have to go to to learn how to make a glass stuff especially a dildo. I do know the glass is hot while its being formed so you have to make the right moves before it cools and you cant touch it to mold it only your tools can touch it..