Jai Ma!

Well i heard that Ucchista Ganapati is worshiped among some Tantrics as he is Tantric form of Ganesha, but i was woundering where in India are so called Tantric Ganapatyas and where can one find one?

I'm also interested in reading some good texts about Ganesha in Tantra, if you know what i mean?

I hope for some answer and i wish you all the best,
Advaita