There are some on GrabCAD worth looking at.

Effectively you have 4 options.

Manual stuff like Multigrip / Dickson holders.
Gang Tooling, might be worth a look pending what type of stuff you turn.
Turret - rachet / pawl
Turret - pnuematic (or similar) locator function

There is a guy on ebay making very decent looking turrets - sells them for around £500 ish. The only reason I havent bought is that they do max 10mm tools and Id like larger for my lathe.

https://www.ebay.co.uk/itm/Diy-cnc-l...wAAOSwK~RZ-JvI

Not seen him list them like this (in kit form) before.

Spoken to him extensively on whatsup, does this for day job too, seems to know his stuff, worth a look. He also has a gang tool setup for sale but might be too big for a Myford.