I can't remember ever seeing even a non-telescoping 3/8" hand driver. I think every one I've ever seen has been 1/4".

EDIT: wanted to search a bit. Here are some non-tele ones anyway, since I wanted to see these for myself:
- https://smile.amazon.com/Teng-Tools-Spinner-Handle-M380015-C/dp/B0001P0X4C/
- https://smile.amazon.com/Stanley-Proto-J5267-Flexible-Spinner/dp/B001HWEBUU/