OK... so one of the appeals of taurus is also one of their major shortfalls.... due to their warranty deal, they want you to send your guns in for them to work on. Which means that pretty much nobody can get parts for a taurus. I have tried to call and get parts from them, doesnt work, gun has to go in. Most dealers won't work on taurus because they can't get parts either.
As for aftermarket lazer grips and such... if it's not on the internet I doubt it exists....